Your sister's brother's aunt's niece's uncle is your which relation ?

Your

Sister's

Brother's

Aunt's

Niece's

Uncle

is your UNCLE !!

What relation is your aunt's cousin's daughter's wife to you ?

What relation is your mother's husband's daughter's brother's uncle's cousin to you ?

What relation is your father's brother's son's father in law to you ?

What relation is your father's sister's husband's son to you ?

What relation is your sister's mother's son's wife to you ?

What relation is your son's uncle's brother's grandfather to you ?