This is a late response, but
I thought my opinion mighthelp.

I have two small children as well, and I have tried 3-11 and cannot do it. Kudos to you and your dh for being able to do this.
As for the job offer, why not see what his day to day operations are like?
I would tour his office on my off day to see what he's like on his own, what the other staff are like and if his offer is suited to your needs. If it's all that he says it is, I'd get his offer in writing and take it.
Good luck to you and keep us posted. Sounds interesting!