Words given on the left side of (::) are related with each other by some Logic/Rule /Relation. Select the missing word/word pair on the right side of (::)from the given alternatives based on the same Logic/Rule/Relation.

Sister : Brother :: Niece : ?

Nephew

Sister : Brother :: Niece : ?

The logic followed here is :

Sister is the female counterpart of male brother

Similarly

Niece : ?

Niece is the female counterpart of male Nephew