What Is Your Mother's Cousin to You? (And What Would My Dad's Cousin Be to Me?)
What is your mother's cousin to you? If she means her first cousin, that person is your first cousin once removed. And here is the part that surprises most people: your dad's first cousin is also your first cousin once removed. The answer is identical on both sides of the family. Whether the connection runs through your mother or your father makes no difference at all to the label, because cousin terminology in English does not track which parent you came through.
This article is about that symmetry. Not the counting method, not the DNA deep dive, just the one question people keep asking twice: does it change if it is my dad instead of my mom? It does not. But there are a few things that genuinely are different between the two sides, and those are worth knowing too.
What Is Your Mother's Cousin to You? The Direct Answer
Your mother's cousin is your cousin of the same degree, once removed.
- Your mother's first cousin is your first cousin once removed
- Your mother's second cousin is your second cousin once removed
- Your mother's third cousin is your third cousin once removed
Swap "mother" for "father" and nothing in that list changes. Your dad's second cousin is your second cousin once removed, exactly like your mom's second cousin would be.
The word "removed" is doing one job and one job only: it counts the number of generations between two people. Your mother and her cousin are the same generation as each other. You are one generation below your mother. So you are one generation below her cousin, which is one removal. That is the whole mechanism.
If you would rather not count anything at all, the free relationship calculator at cousinchart.com takes two people and returns the exact term. But the rule above is short enough to memorize, and once it clicks you will never need to look it up again.
What Would My Dad's Cousin Be to Me?
Your dad's cousin is your first cousin once removed, assuming it is his first cousin. The relationship name is the same one you would use for your mother's cousin.
People search for this separately, and it makes sense that they do. Families often feel lopsided. You might have grown up seeing your mom's side every holiday and your dad's side once a decade, or the two sides might use completely different words for the same relatives. When one side feels distant and the other feels close, it is natural to assume the terminology must be different too.
It is not. English kinship terms are what anthropologists call bilateral and symmetrical: the same word applies to a relative whether they reach you through your mother or your father. Your mother's sister and your father's sister are both simply "aunt." Your mother's father and your father's father are both "grandfather." Cousins follow the identical logic.
Plenty of other languages do not work this way, which is a large part of why the question keeps coming up. In Hindi, your father's younger brother is chacha and your mother's brother is mama, two entirely different words for two relationships English flattens into "uncle." In Mandarin, paternal and maternal cousins take different prefixes. If your family speaks one of those languages at home, English can feel suspiciously vague, and you may reasonably wonder whether you are missing a distinction. You are not missing one. English simply never made it. Our companion piece on cousin bro goes into that difference in detail, because the "cousin brother" construction exists precisely to put some of that missing precision back into English.
The Symmetry Table
Here is every common version of the question in one place. Read the left column as "my parent's ___" and the right column as what that person is to you.
| Your parent's relative | What they are to you | Generations apart |
|---|---|---|
| Mother's first cousin | First cousin once removed | 1 |
| Father's first cousin | First cousin once removed | 1 |
| Mother's second cousin | Second cousin once removed | 1 |
| Father's second cousin | Second cousin once removed | 1 |
| Mother's third cousin | Third cousin once removed | 1 |
| Father's third cousin | Third cousin once removed | 1 |
| Mother's first cousin once removed | First cousin twice removed | 2 |
| Father's first cousin once removed | First cousin twice removed | 2 |
| Grandmother's first cousin | First cousin twice removed | 2 |
| Grandfather's first cousin | First cousin twice removed | 2 |
Notice the last four rows. Every extra generation you climb adds exactly one removal and leaves the cousin number untouched. Your grandparent's first cousin is your first cousin twice removed, which has its own full guide over at 1st cousin 2x removed. And a parent's first cousin once removed is the same relationship by a different route: still twice removed from you.
Why the Cousin Number Never Changes
The cousin number is fixed by the common ancestor, and the common ancestor does not move when you switch sides of the family.
Think about what makes your mother and her first cousin first cousins: they share a set of grandparents. Those same people are your great-grandparents. You are one rung further down the tree than your mother, but the ancestor at the top is the same ancestor. Nothing about the shape of that tree changes if you redraw it on your father's side instead. The distances are identical; only the names in the boxes are different.
That is why the rule is so reliable. Two numbers determine everything:
- The cousin number comes from the closer of the two people's distance to the shared ancestor
- The removal count comes from the difference between those two distances
Neither number has any input for "which parent." There is no place in the calculation to put that information, which is the cleanest possible proof that it does not matter.
The same two-number rule keeps working no matter how far out you go. It still produces correct answers at the 5th cousin level, where the shared ancestors are your 4x-great-grandparents and the DNA evidence has mostly evaporated. And when you start seeing these relationships written as 1C1R or 2C1R in genealogy software and DNA match lists, the notation is decoded in abbreviation for cousin.
What Actually Is Different Between the Two Sides
The relationship label is identical on both sides. Three other things are not, and these are the real answers hiding behind the question.
Surnames
In families that pass down the father's surname, your dad's cousins are more likely to share your last name, and your mom's cousins are more likely not to. That makes paternal cousins easier to spot in records, obituaries, and search results, and it makes maternal lines quietly harder to trace. It has zero effect on how closely related you are. It only affects how findable people are.
Mitochondrial DNA and Y-DNA
These two specialty tests follow single lines and are wildly asymmetrical.
Mitochondrial DNA passes from a mother to all of her children, but only her daughters pass it on again. So you carry your mother's mtDNA, and you share it with a maternal cousin only if the connection between you runs through an unbroken chain of women on both sides. Y-DNA is the mirror image: it passes father to son only, so it exists on the paternal side and only for men.
The practical result is that a maternal relative and a paternal relative who hold the exact same position on your family tree can look completely different on these two tests. One might be a perfect mtDNA match while the other cannot be, purely because of which parent stands in between.
X-Chromosome Inheritance
X-DNA is the one that trips up experienced genealogists. Its inheritance is genuinely lopsided:
- A man inherits his X chromosome from his mother only
- A woman inherits one X from each parent
- A father passes his single X to every daughter and to none of his sons
That means if you are male, you cannot share X-DNA with anyone through your father, full stop. If you are female, any X you got from your father traces back through his mother, never through his father. So certain paternal-side relatives are structurally excluded from ever being X matches, no matter how genuinely related they are.
None of this changes what to call anybody. Your dad's cousin is still your first cousin once removed. But if you are working with DNA results, the side of the family absolutely matters for interpreting them, even though it never matters for naming.
The Reverse Direction
You are also their first cousin once removed. The term is fully reciprocal.
This is one of the most useful facts about removed relationships and one of the least known. "Once removed" describes the gap between two people, not a rank or a direction. There is no senior version and junior version of the phrase. If your mother's cousin is your first cousin once removed, then you are their first cousin once removed right back, and the same holds for your father's cousin.
Which means the relationship also runs the other way through your own generation. Your first cousin's child is your first cousin once removed, for exactly the same structural reason your parent's first cousin is. Both people sit one generation away from you with the same shared-ancestor distance. Two very different-feeling relatives, one label.
What Their Children Are to You
Your parent's first cousin's children are your second cousins. This is the step almost everyone gets wrong.
The logic: you and those children are both three generations below the shared great-grandparents. Equal distance, no removal, and three generations up from a person means second cousin. So the older generation is your first cousin once removed, and their kids drop neatly into second-cousin territory alongside you.
Keep going and it stays tidy:
| Person | Relationship to you |
|---|---|
| Your parent's first cousin | First cousin once removed |
| That person's child | Second cousin |
| That person's grandchild | Second cousin once removed |
| That person's great-grandchild | Second cousin twice removed |
The pattern in that table is worth internalizing. Once you have anchored one person correctly, every descendant of theirs follows automatically. If the "second cousin once removed" row is the one you actually needed, the shorthand version of that relationship is covered in 2nd cousin 1x removed, including how it looks on a DNA match list.
What to Actually Call Them Out Loud
Call them "cousin," or call them by their first name. Nobody says "first cousin once removed" at a birthday party.
The precise terms exist for genealogy, legal documents, medical family history, and DNA analysis. They are not conversational, and insisting on them at a family dinner tends to land badly. In practice, most families settle on one of a few approaches:
- Just the first name, which is what the majority of American families do
- "Cousin" plus the name, more common in the South and in many Black American families
- "Aunt" or "Uncle" as a courtesy title, especially when the person is a full generation older
That last one causes a lot of the confusion in the first place. If you grew up calling your mother's cousin "Aunt Renee," you may have gone years assuming she was your mother's sister. Courtesy aunts and uncles are extremely common and completely fine. Just do not let the nickname overwrite the actual relationship when you sit down to build a family tree or fill out a medical form.
Where People Go Wrong
Three mistakes account for nearly every wrong answer to this question.
Calling them a second cousin. This is the big one. A second cousin is someone in your own generation who shares great-grandparents with you. Your parent's first cousin is a generation up from you, which makes them removed, not second. The two relationships are genuinely different and share different amounts of DNA.
Assuming age determines the label. Removals count generations, never years. Your first cousin once removed can easily be older than you, younger than you, or your exact age. Large families with big age gaps between siblings scramble the generations all the time. A four-year-old can be your first cousin twice removed.
Assuming the side matters. Which is the point of this whole article. The answer to what is your mother's cousin to you is the same answer you would get for your father's cousin, every time.
If you want the underlying counting method spelled out step by step rather than the shortcut, or you want to work with a cousin whose degree you are not sure about, that is what the calculator on cousinchart.com is for. Feed it two people and it handles the arithmetic.
Frequently Asked Questions
What is your mother's cousin to you in one sentence?
Your mother's first cousin is your first cousin once removed, and the same term applies to your father's first cousin, because English cousin terminology does not distinguish between the two sides of the family.
What would my dad's cousin be to me if it is his second cousin?
Your second cousin once removed. The rule holds at every degree: whatever kind of cousin they are to your parent, they are that same kind of cousin to you, once removed.
Is my mother's cousin my aunt?
Not biologically. An aunt is your parent's sister or your parent's brother's wife. Your mother's cousin is a first cousin once removed, though many families use "Aunt" as a warm courtesy title for exactly this relationship, and there is nothing wrong with that.
Why do people think the mother's side and father's side are named differently?
Usually because many languages genuinely do name them differently, and because family closeness and surnames are often lopsided between the two sides. English kinship terms are symmetrical, so the label stays the same even when the family experience does not.
Does the side of the family matter for a DNA test?
For the relationship name, no. For interpreting results, yes. Mitochondrial DNA, Y-DNA, and X-DNA all follow lines that are specific to one side, so two relatives in identical tree positions can produce very different specialty-test results depending on which parent connects you.
What is my mother's cousin's child to me?
Your second cousin. You and that child sit at equal distance from the shared great-grandparents, so there is no removal, and three generations up to the common ancestor makes it second cousin.