One? There are like 4 of them already...
Exactly one f-up person is enough and now only one person (in moon fam) is sane(╯°Д °)╯╧╧
Who?
The mom who thinks her husband is a freak and her children shouldn't like each other (even if they aren't biological) nor herself (mc liking her mother). She's the most sane (not perfectly tho)
make sence
Oh please don't tell me the oldest son likes the mother too???? Cant we just have one incestuous person!!??