IMHO, I wouldn't worry about the boss and his son being jerks or liking Trump or saying jerky things about poor people, if everything else is good. He's your boss, not your friend.
If you aren't happy about the actual work and they have hired a new person to do work similar to yours while at the same time extending your probation, that's a bit worrisome. I'd keep an eye on what's happening, but would not outright quit unless it's totally insufferable. You haven't been there that long, it will take a long time to find a new job and that one might suck as well. Try to stick with it.
I think it's obvious that your employers are not going to offer any help for personal problems, and even hold them against you, so I would avoid talking about them at all.
If you are thinking of getting pregnant, now sounds like a great time.