Do you have any headcanons of Grelle/Lucifer dealing with their kids being bullied? Like how would they deal/comfort/want them to grow from it?
Hello there, Anon! I'm happy that you're interested in my fanmade family for Lucifer! Yeah, I've in mind a few about how the demon-human halflings live in the Devildom knowing how the full fledged demons don't seem to like "half-breeds" as that's a popular offensive name for calling half human and half demon children.
Luciela Morningstar, who's the eldest daughter of the family really doesn't give a single cent about the demons calling her that name, Lucifer taught her from a very young age(since she was four) that not everyone will like her for who she is, but she doesn't need to worry about it, that she's her father and mother's most precious half demoness and that to them she's precious the way she is. Though she does get upset when her mother's badmouthed in front of her. In my own headcanon, Grelle is seen bad for being the Avatar of Pride's human wife, and so called a pathetic human for demon fodder, that is when she reacts in a feral way, taking out her demon side.
When asked about why she did that, she can't handle the insults given to her mother, so she cries that her mother was told that way. Grelle is used to insults like that, since Satan and Belphie never really accepted her or liked her, so she isn't hurt about that, but she's hurt about seeing her daughter so upset and crying about what her mother was called. Lucifer is just quite furious, he doesn't let anyone speak ill of his wife, but he wants to set a good example for his daughter, so he both comforts her and lectures her about what to do next time, in case the same insults about Grelle are told to her. It's like a lesson of life.
"My daughter, you know full well that your mother is not that and that what other demons say about her, should not affect you. I want you to stand your ground next time, but not really attack them, just use words. That's it."
Noctifer Morningstar is the second oldest son, he's way more frail and sensitive than his oldest sister, he got his mother's personality. A very easily worked up half demon, he's the blank of bullying quite a lot, he isn't like Luciela who attacks and beats up whoever calls her names about Grelle, he just cries on the spot, causing his sister to come and defend him. When brought home to the parents, he explains to them what he's called, in tears. Both parents are upset, since he's their son and like his parents they have to support him. Grelle is more about hugs and lullabies when her children are hurt by other demons. Lucifer does hug them, but not too much, he believes he should teach them to be independent and not too used to Mom and Dad, because not always they will be there for them, so it's a good thing to teach.
"Noctifer Morningstar, you should know whose son are you. My son, and you should be proud of who you are, what that demon simpletons say is untrue and you should not be affected by it. Next time tell them whose son are you, and that your father will personally come and have a chat with them."
Lucifer shows tough love, but not in a bad way, he teaches his kids to be able to defend themselves. Hugs and comfort are okay, but not always at all times, that's not what he wants to teach, he can comfort them all he wants, but also he can teach them lessons of life that will be useful for them in the future.
The twins, Lucien and Lucian Morningstar are too young, they're five and they don't really go out of home, they always stay wether with Grelle or Lucifer when either of them are around. Lucifer teaches them the same he's taught his two oldest, about how they shouldn't let others words affect them because they're perfect in their eyes. But it doesn't mean that Lucifer won't go and find those demons himself, of course he does, but he doesn't mention that to the kids. That's why that the four children aren't bullied anymore. Papa Luci won't let some other pathetic bully demon put his kids insecure about who they are. Oh, no. He teaches them a big lesson of course and let's just say it's effective because the demons who dared bullied the children of the Avatar of Pride never really bullied them again or spoke ill of Grelle in front of them.