I feel like the dad is one of those delinquents, who "corrupted" the innocent student council president in school :')
Also I guess people can argue that he's a bad parent or whatever, but I think what they fail to appreciate is that even though he has a selfish personality, he still seems to be really attracted to his wife and wanted to monopolize her for a while.
I think that's a good thing at it's core. He might be a piece of work, but that seems a lot better than Senpai's parents growing distant or his father cheating etc.
And honestly I think that the mother secretly liked having a little alone time with her husband as well. It's not like the dad held her hostage or cut the landline.
Otherwise it would be weird that she just accepted, whatever white lies the father fed her without fact checking them at all.