He is your mother's husband.
My father.
She is your father's wife.
He is your wife's mother.
My mother-in-law.
My step-father.
He is your father's father.
My grandfather.
She is your mother's mother.
My grandmother.
She is your husband's sister.
My sister-in-law.
She is your father's new wife.
My step-mother.
He is your father's son, but not you.
My brother.
She is your mother's sister.
My aunt.
He is your wife's brother.
My brother-in-law.
He is your new brother, but not your father's son.
My step-brother.
He is your mother's brother.
My uncle.
She's your mother's daughter, but not you.
My sister.
He is your wife's father.
My father-in-law.
She is your new sister, but not your mother's daugther.
My step-sister.
He is your aunt's son.
My nephew.
She is your aunt's daughter.
My niece.