Apparently not so pure, otherwise all of them would have sharinganI mean there a family right? Yet there considered a clan and a clan is a group of people when others in the mix so most likely they were either all half uchiha or alot of incest happened..
incest? are you talking about cousin marriage ? there a lot of country where marriage between cousin is allowed and not considered as incest i Think japan is one of it .
V.V uhh troll thread