Your sister's daughter is your...
niece
Your dad's father is your...
grandfather
Your mom's brother is your...
uncle
Your daughter's daughter is your...
granddaughter
Your female child is your...
daughter
Your male child is your...
son
Your uncle's daughter is your...
cousin
Your dad's wife (who is not your mother) is your...
stepmother
Your son's male child is your...
grandson
Your mother's grandmother is your...
great-grandmother
Your mom's mother is your...
grandmother
Your husband's brother is your ...
brother-in-law
Your brother's son is your...
nephew
Your wife's mother is your...
mother-in-law
Your aunt's son is your...
cousin
Your dad's sister is your...
aunt
Your husband's father is your...
father-in-law