Your grandfather's wife's grandson's aunt's sister is your which relation ?

Your

Grandfather's

Wife's

Grandson's

Aunt's

Sister

is your SISTER !!

What relation is your brother's aunt's sister's father to you ?

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

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

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

What relation is your aunt's niece's brother's grandmother to you ?

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