If you're referring to support for a period prior to the child's death, you don't remove it.
You should consult an attorney to discuss your options and whether a child can sue for back child support in your state. There may be a statute of limitations.
It belongs to the child.
You have to present a Death Certificate to the court that issued the child support order and request that the order be terminated. If you obtain custody it will be terminated permanently. If there is another guardian appointed for the child a new child support order will be issued.
You mother.
Should have already.
Yes, if there's a significant change in either parent's circumstances, or one child has emancipated or died.
No. The child support was owed to the custodial parent and not the child. In order to obtain a judgment lien the adult children would need legal standing to bring suit in civil court- they wouldn't qualify. Also, there may be a statute of limitations. They, and their mother, should consult with an attorney who specializes in family law to determine if their mother can file a claim against the estate.
Yes. The court should be notified by filing a copy of the child's death certificate. However, any arrears that exist at the time of the child's death must be paid.
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.
Need clarification on the question. Friend and his 15 year old child mother?
Barring any changes in Child Support law, there is no Statute of Limitations on arrears. This means that the noncustodial parent will never be free of accumulated arrears plus interest accrued until the full amount has been paid either to the custodial parent or the custodial parent's estate, if they have died.
His debts died with him. His widow and former family have nothing to do with the matter.