Board Thread:Theories and Speculation/@comment-25547449-20160618183651/@comment-25122992-20160618184225

Actually, there's no sign of the Main/Branch family system existing during Kaguya's lifetime. Rather it was established inside the Ootsutsuki clan residing on the Moon, i.e. between Hamura's descendants. But yeah, we know very little about the "initial" Ootsutsuki clan Kaguya and Momoshiki/Kinshiki came from (their homeworld, their actual origins, their means of interdimensional travelling and goals while doing so).