Your brother's father's sister's niece's brother+in+law is your which relation ?

Your

Brother's

Father's

Sister's

Niece's

Brother in law

is your BROTHER IN LAW !!

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

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

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

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

What relation is your daughter's grandfather's son's son in law to you ?

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