Hey,
You just have to suck it up. Nursing school won't last forever. Find help with the kids. Call in a relative or ship them off. I'm not trying to be cold as I'm a devoted father too, but you'll be doing it for them. Don't expect any breaks or even to be treated equally because it's just not going to happen. Their job is to weed you out and they can and will get away with it. It does get a little easier after you graduate, but not a whole lot. A technique I used on instructors that were picking on me was to study real hard and come up with questions that were either very difficult or impossible for them to answer. They might decide that picking on you just isn't worth the price. But under no circumstances give them any reason to go after you.
Best of Luck