My spouse's mother
my mother-in-law
your mother's sister
my aunt
your mother's brother
my uncle
your spouse's sister
My sister-in-law
Your sister's daughter
my niece
your daughter's son
your grandson
Your parents' daughter
My sister
your stepmother's children. They are Not your sisters or brothers.
stepsisters
Your father's wife. She isn't your mother.
stepmother
Your brother's son
my nephew
Your uncle's children
my cousins