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

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

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

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

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

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