all they do is argue and fight
So do a lot of other couples. They're just better at hiding it.
Still no excuse though. Just makes me glad I'm single. Sounds like a csde of 'staying together for the sake of the kid(s)'. It never works. Someone I know did this and I still think her home is more broken than mine will ever be (you hear them rowing constantly when you walk past- them too have just had another baby!)
I'm guessing SS are involved. We never had an inkling that one woman had any interaction until the night her children were all taken away under an EPO. Turned out they'd been involved for years.