I don't know what Belial's beef is with them. So I'll leave it to you.
Angels and demons have a personal hatred for one another, don't they?
So wouldn't Belial be furious that a demon not only mated with an angel, but they bore a child as well?
I suppose you're right >_>
Maybe more for demons that were raised as demons. I established earlier with Angelo, thanks to Mel, Sadie, and Tyler (though, more Mel and Sadie than Tyler), angels were starting to see that good can come from any being. The demons might harbor some ill will, though.
There's also that tsundere thing Angelica has with Mel.
^Is that supposed to be a surprise at this point, Gubbey? If so, I'll edit it out.
"Fun Fact: Nothing that starts with 'Fun Fact' is fun, and half them aren't even facts." - Itennu