You're a member of Otsutsuki family. You have two brothers, Hamura and Hagoromo. Well, that was until Kaguya, your mother, came with a black thing on her hands...

Kaguya:"Look, kids. This is your new brother, Zetsu."

Hagoromo:"..."

Hamura"..."

Both of your brothers just stay quiet, looking at the black "thing" called Zetsu.