Your brother's sister's aunt's son is your which relation ?

Your

Brother's

Sister's

Aunt's

Son

is your COUSIN !!

What relation is your uncle's daughter's sister's wife to you ?

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

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

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

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

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