READ RIGHT TO LEFT LIKE JAPANESE MANGA. Haha lol! If you don't get it, I'll explain it. In all the scenes in the anime where it shows the Hyuga clan, we only see people with Byakugan eyes - Male and female, mums and dads. Which means that; brothers and sisters or cousins, cousins twice removed etc have been having kids. An interesting fact is that as a result of in-breeding like this, children can be born albino with white eyes! Lol! XD