Your grandmother's grandson's aunt's niece's brother+in+law is your which relation ?

Your

Grandmother's

Grandson's

Aunt's

Niece's

Brother in law

is your BROTHER IN LAW !!

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

What relation is your aunt's husband's son's brother in law to you ?

What relation is your sister's grandmother's grandson's uncle to you ?

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

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

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