من الويكي :

In the earlier stages of the series, Kakashi stated that there are rumours the Uchiha clan's Sharingan was derived from the Hyūga clan's Byakugan.[22] However, Kurama is the only one to know the full truth about the Uchiha clan yet appears to have no intention of revealing what it knows.[23]

و بعدين الشارينقان أتت من الأبن الأكبر , و بكذا كيف تكون اليوتشيها فرع للهيوجا ؟؟؟