What Is a Second Cousin Once Removed?
It's the relationship label people most love to puzzle over. Here's exactly what "second cousin once removed" means — and how to spot one in your own family.
The phrase combines the two ideas behind every cousin label: how far back you share an ancestor, and whether you're in the same generation. Break it into those two parts and it's simple.
The 'second cousin' part
Second cousins share a set of great-grandparents. Your grandparents' siblings' grandchildren are your second cousins — you're both three generations down from the same couple. First cousins share grandparents; second cousins go one generation further back.
Build your family tree — free
Kinidhi's tree maker lets you add relatives in a few taps, with the correct kinship term computed for every relative. No sign-up, nothing leaves your device, and you can download the finished tree as an image.
Open the free tree maker →The 'once removed' part
"Removed" signals a generation gap. "Once removed" means one of you is a generation older or younger than the other, relative to the shared ancestor. So a second cousin once removed is not in your own generation — they're a step up or down.
The two people it can be
Put together, your second cousin once removed is either: (1) the child of your second cousin (a generation below you), or (2) your parent's second cousin (a generation above you). Both fit the same label, just in opposite directions.
How to check on your tree
Find the most recent common ancestor. Count generations to each person. If the nearer person reaches the ancestor in three generations (making the base relationship second cousins) and the other person is one generation further, they're "once removed." A family tree tool can compute this automatically.
Build your family tree — free
Kinidhi's tree maker lets you add relatives in a few taps, with the correct kinship term computed for every relative. No sign-up, nothing leaves your device, and you can download the finished tree as an image.
Open the free tree maker →Does the distinction matter?
For everyday life, "cousin" is often enough. But for genealogy, DNA matching, and an accurate family tree, the precise label matters — it tells you exactly how two people connect and helps confirm or rule out relationships.
Frequently asked questions
Is my second cousin's child my second cousin once removed?
Yes. Your second cousin's child is one generation below you relative to your shared great-grandparents, which makes them your second cousin once removed.
What's the difference between 'removed' and the cousin number?
The number (first, second) tells how far back you share an ancestor; 'removed' tells how many generations apart the two cousins are. They measure different things.