
I would suggest that you call the Family Court in your area and ask them.
I would also suggest a consultation with a Family attorney....they HAVE the answers.
How I see it is that the children are still minors.
He should have continued support regardless of what the wife said, even if he put away the monthly payments in a bank account. She could, if she has an enforceable child support order, say that he quit making payments!...He would still be liable for all that back support. If he did not get a Change in support orders from the Court, he could be in 'trouble'.
We here are not lawyers nor are our particular state laws the same as Michigan law. Don't go this alone.. .do get a consult with a Family Law attorney. I don't think they can come after you personally for the payment, but the monies in a marriage are co-mingled, and in that instance, part of your money may have to go into those payments so your husband would be in compliance with any child support order or he may wind up in jail.
It works both ways, you know. Many second marriage husbands support the children of their wives. It doesn't last forever....and in this case, the kids are almost of age.
Here are some resources for you..
http://courts.michigan.gov/scao/self...ly/support.htm