What is your father's sister's son's son to you?

Answer 1

She is your first cousin, once removed, because your father's brother is your uncle, your uncle's son is your first cousin and your first cousin's daughter is your first cousin, once removed.

She and your child will be second cousins to each other.

Answer 2

Your father's mother is your grandmother. Her brother's daughter's daughter is his grand daughter. Two people who are the grandchildren of siblings are second cousins to each other.

Answer 3

Your father's sister is your aunt. Your aunt's son's son is her grandson.

Your aunt's grandson is your first cousin, once removed.

Answer 4

Your father's brother's son is your cousin