Your sister is your grandfather's
granddaughter
Your uncle's daughter is your
cousin
Your mother's sister is your
aunt
Your brother is your father's
son
Your father's father is your
grandfather
Your sister is your mother's
daughter
Your father's daughter is your
sister
Your father's son is your
brother
Your mother's brother is your
Uncle
Your mother's husband is your
father
Your father's wife is your
mother