I suggest that you get in touch with your State's child support agency.
If you mean, the child's mother (ex-wife) has custody, the child's father (ex-husband) is obligated or potentially obligated for support.
You don't. Once the child is an adult, child support is moot and the ex is home free.
No....
Yes of course if he has custody.
contact child support enforcement.
There are many Internet companies on which you can run a search.
Your ex has to continue paying child support. Marriage doesnt change anything because your ex is still the biological father. Unless youre husband adopts your child ... thts a different story.
Your ex-husband's death does not change your support obligation - the child's needs continue. And, even if the child is of the age of majority, the money is still owed the father's estate.
Yes, of course.
possibly
No. If your present husband is the father of the children of his previous marriage and is the custodial parent he would have to sue his ex-wife (the children's mother) for support.
child support cannot be cleared