Your brother's aunt's brother+in+law's son's father is your which relation ?

Your

Brother's

Aunt's

Brother in law's

Son's

Father

is your UNCLE !!

What relation is your aunt's son's father in law's daughter's wife to you ?

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

What relation is your sister's aunt's niece's son to you ?

What relation is your uncle's brother's daughter's father to you ?

What relation is your mother's daughter's aunt's nephew's grandfather to you ?

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