You are your grandparents'...
I am my grandparents' GRANDSON/GRANDDAUGHTER
Your father's daughter is your...
She's my SISTER
Your brother's mother is your...
She is my MOTHER
Your wife's parents...
They are your PARENTS-IN-LAW
Your dad's new wife's sons...
They are my STEP-BROTHERS
Your father is your mother's...
He's my mother's HUSBAND
Your mother’s sister is your...
She is my AUNT
Your mother's daughter...
She's your SISTER
Your father's wife...
She's your MOM
Your father’s father is your...
He's my GRANDFATHER
Your brother's son...
He's your NEPHEW
Your sister's son...
He's your NEPHEW
Your father's son is your...
He's my BROTHER
Your cousin's sister is your...
She's my COUSIN
Your mother is your father's...
She's my father's WIFE
Your mum and dad are your...
They are my PARENTS
Your uncle’s son is your...
He is my COUSIN
Your daughter's husband...
He is my SON IN-LAW
Your brother's wife...
She's your SISTER-IN-LAW
Your mother's husband...
He's your FATHER
Your sister's daughter...
She's your NIECE
Your dog/cat is your family's...
It's my family's PET
Your son's daughter...
She's your GRANDDAUGHTER
Your sister's husband...
He's your BROTHER-IN-LAW
Your mother’s brother is your...
He is my UNCLE
Your daughter's son...
He's your GRANDSON