You should be able to persuade the court to terminate support (but you would still owe any unpaid support that accrued prior to that termination.
Probably, zero.
Yes, and even if he's not the father.
Your marriage to someone who is not the father of the kids should have no effect on your right to child support from their father.
They end. The child may be entitled to Social Security benefits from the father.
Termination of parental rights does not, in itself, terminate child support.
Not sure what a "non biological father" is, but the only thing that could happen is that the (former) payor is excused from paying future support. He cannot recover the support already paid.
Divorce is something that happens between spouses, not between parents and children. A child's refusal to see the father does not affect the father's child support obligation.
No, at the maximum for the states of Ohio and Michigan, the limit is 23 years of age to file for retroactive child support.
Yes and all men should as there's a 30% chance he's not the father. see link
If an order is still in place, yes, even in Michigan. see links below
The support is still owed and SS benefits of any sort are subject to garnishment for child support obligations.
No. At the maximum, in Michigan, you have to file prior to age 23. But, don't assume he didn't. see link