I don't know that much about the business you run, but it does seem to be an incredibly difficult situation that you find yourself in with a WAH/MLC and a family business.
There's some books out there about people with joint businesses when this happened (mostly written by women!), and they got the business valued by a L. Then one person had to buy the other out. So for example, he could keep the business and pay you for your half. Plus child support plus alimony, especially because of the situation he left you in. Or you could keep it but then you'd have to run it. He can't just walk away and leave you with all the responsibilities and no financial future, especially after a long marriage -- though he may try. Have you talked with a L?
