Montana - can you wait until Fall to start HSing? the baby will hopefully be a bit more settled. Also, while not ideal, when I had my baby, I could trust DS7 and DS4 to sit and watch TV while I napped for an hour or so. Can you trust your boys to do that? I needed those naps.

Also, what is your older son like? Can you go over say math, history, writing and then expect him to sit and do the work on his own? Some have miraculous kids like that lol but I don't. Or, can DH do some of the HSing in the evenings when he's home? Also, you can do whatever schedule. You can say take Mon-Tues as weekends and let kids play, and HS on Sat and Sun when Dh is there to help.

Some of the issues w/ the 3.5yr old could be the new baby. Even w/ the 7.5yr old especially if things aren't going well at school. Believe me, I know how hard it is to sort things out.
hugs

Dazey