Relationship Finder

Family relationship calculator

Tap or type “my mom's cousin's daughter” and see who that is on a family tree.

My
    …

    Tap relatives in order, like mother, cousin, daughter
    More: grandchildren, great-, half-, step- and in-laws
    Any sex Grandchildren and great- Half Step In-laws

    How the name is worked out

    Find the closest ancestors you and your relative both come from. Count the generations from you up to them, then from them down to your relative.

    If one count is 0, it's a straight line: parent, grandchild, great-grandmother. If one count is 1, it's a brother or sister, an aunt or uncle, or a niece or nephew. Anything else is a cousin. The cousin number is one less than the smaller count, and the gap between the two counts is how many times “removed”.

    Some chains fit more than one person. “My mom's son” is you or your brother, so the finder shows each possibility.

    Cousin chart

    Pick the row for how one person descends from the shared ancestor and the column for the other. “1x removed” means once removed.

    Show the cousin chart

    Rows: person A’s relationship to the common ancestor. Columns: person B’s. Cell: what B is to A.
    A ↓ · B →Common ancestorChildGrandchildGreat-grandchildGreat-great-grandchild3rd great-grandchild4th great-grandchild5th great-grandchild
    Common ancestorSame personChildGrandchildGreat-grandchildGreat-great-grandchild3rd great-grandchild4th great-grandchild5th great-grandchild
    ChildParentSiblingNiece/nephewGreat-niece/nephewGreat-great-niece/nephewGreat-great-great-niece/nephew3rd great-grandniece/nephew4th great-grandniece/nephew
    GrandchildGrandparentAunt/uncle1st cousin1st cousin 1x removed1st cousin 2x removed1st cousin 3x removed1st cousin 4x removed1st cousin 5x removed
    Great-grandchildGreat-grandparentGreat-aunt/uncle1st cousin 1x removed2nd cousin2nd cousin 1x removed2nd cousin 2x removed2nd cousin 3x removed2nd cousin 4x removed
    Great-great-grandchildGreat-great-grandparentGreat-great-aunt/uncle1st cousin 2x removed2nd cousin 1x removed3rd cousin3rd cousin 1x removed3rd cousin 2x removed3rd cousin 3x removed
    3rd great-grandchild3rd great-grandparentGreat-great-great-aunt/uncle1st cousin 3x removed2nd cousin 2x removed3rd cousin 1x removed4th cousin4th cousin 1x removed4th cousin 2x removed
    4th great-grandchild4th great-grandparent3rd great-grandaunt/uncle1st cousin 4x removed2nd cousin 3x removed3rd cousin 2x removed4th cousin 1x removed5th cousin5th cousin 1x removed
    5th great-grandchild5th great-grandparent4th great-grandaunt/uncle1st cousin 5x removed2nd cousin 4x removed3rd cousin 3x removed4th cousin 2x removed5th cousin 1x removed6th cousin

    Cousins, “removed” and great-aunts

    What is my cousin's child to me?
    Your first cousin once removed. They are one generation below you, so the relationship is “removed” once. To your own children, your cousin's child is a second cousin.
    What is my mom's (or dad's) cousin to me?
    Your first cousin once removed. Their children are your second cousins.
    What does “once removed” mean?
    One generation of difference. Cousins in the same generation aren't removed. A cousin's child or a parent's cousin is once removed; a cousin's grandchild is twice removed. It works both ways.
    What is the difference between a second cousin and a first cousin once removed?
    Second cousins are the same generation and share great-grandparents, like your parent's cousin's child. A first cousin once removed is one generation apart: your cousin's child, or your parent's cousin.
    Is it great-aunt or grand-aunt?
    Both are used. “Great-aunt” is everyday English; “grandaunt” is common in genealogy because she is in your grandparents' generation. Further up they differ: an everyday great-great-aunt is a great-grandaunt to genealogists.
    What is my cousin's husband or wife to me?
    Informally, your cousin-in-law. They are not a blood relative and have no official title.
    What are my cousin's kids to my kids?
    Second cousins. They are the same generation and share great-grandparents (your grandparents).
    How much DNA do I share with my cousins?
    On average: first cousin about 12.5%, first cousin once removed about 6.25%, second cousin about 3.1%, third cousin about 0.8%. Real amounts vary widely. Half relations share about half as much.