How the hell should we know? You either get raised by a nice woman who then go's mildly batshit insane, Or you start hating each other for no reason while you father knows nothing of Split Inheritance.
Having a psyco mother, who is obessed with power and turns humans into zetsus verus having a father that doesn't understand his own sons eventually leading them to fight to death each and every lifetime until someone breaks the cycle
A maniac power hungry mother that wants to eradicate the world and put it under her control so that all the chakra gets back to her,
or a dumb father who was unaware of his sons intentions,