I would seriously consider his offer. I am in NP school because my husband who owns his own pediatric practice doesn't get paid about 3 months out of the year.
As you know, owning your own practice you are responsible for paying everything: insurance, immunizations, phone, electric, lawn care, computers, comp maintaince etc sometimes the costs end up being more than what you bring in. The stress to us is not worth it and if we had to do it over again, we wouldn't go this route. The stability of drawing a paycheck is worth so much.
He's struggled for 5 yrs now and we are just to the point where we think we can depend on him having a regular income.
Can you calculate how many patients you need to see per day in order to pay overhead and yourself? Are you close to this number? Husband has to see at least 25/day. Winters can average 32 and summers can go as low as 18, so you have to make more in the winter and save it for the summer in order to survive. He can't change jobs because he owns the building which is now very undervalued.
I'm sorry to be so negative, but if someone had told us what life would be like after we did this, I don't think we'd have ever done it. I just don't want to see someone else go through it.