>>280215743
I wouldn't say that they all hate each other. They're just dysfunctional Devils.
Makima probably hated them, as she was willing to erase the whole lot.
The rest seem to be able to co-exist, unless they get in each others' way.
Death Devil is the one the causes most of the family drama right now by constantly interfering with her sisters' lives, and killing them if they displease her.