I bet abusive mom will soon have her uninvited appearance and and chibi succubus will invite her inside for candy or something.
Well, being confrontational and being able to stand up and move forward/catharsis aside be amusing if the other succubi just got rid of her for him or so lol
Although other than her being ended up some kinda beggar in debt or so i imagine onii-san moving away wouldn't let her know his address and such, if the mom didn't fully abandon him at some point (because while it's not impossible, if you're an adult and able to move away from an abusive parent hopefully they wouldn't show up again esp since if it's an apartment a neighbor could see and report them versus just a home life a kid can't talk about/run away from)
That's how pervasive gender roles can be. The thought that only a mother would have that softly concerned attitude.
However, this page also shows that people don't act that way simply by being mothers. Honestly, a lot of commentary in a small space.
Orphanage comment aside, i would've assumed they'd be raised as a collective or so, bc outside of 'retirement' and keeping up with the population, idk how many succubi would wanna have children outside of like just having a fave 'human' and settling down