Sure. Obvious spoilers Spoiler: Spoiler to anyone else reading...but I don't think Alice was the only victim of abuse in the family. If we're talking about the rest of the family, I felt, even though it wasn't as overt as with the eldest son, that it was pretty much implied that the abuse started with the father in the family (could also go further with the mother's father being neglectful too...), hence the cycle of generational abuse. You can see it in the behaviors in the dinner scene, obviously the dad is possessed by a Deadite at this point but at least in the beginning it seemed like nobody was all that shocked by some of his aggressive behaviors like they'd sort of been there before to an extent..and it would also explain why the wife felt compelled to let him back in via her denial/enabling plus the whole "without my family, I am nothing" mindset. This could also explain why the youngest son was so paralyzed to do anything when you'd expect him to take action when his girlfriend was being hurt because you could argue he had a freeze (trauma) response.