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Question:

What is the relationship between someone whose grandmother is the sister of my great-grandfather?


Best Answer - Chosen by Asker: Kristy is the only one who is correct. You are second cousins once removed.

Great-great grandparents
. . . /................................ . . .
Grandma................ Great-grandpa (brother/sister)
. . ./............................... . . .
Parent........................... Grandparent (first cousins)
. . ./............................... . . .
Child............................ Parent (second cousins)
. . ./............................... . . .
(empty).......................... You

Your relationship to "child" is second cousin-once removed because the last direct link is second cousin through your parent, and then you are one generation removed from that direct connection. You would only be a third cousin to anyone born to "child".