See a lawyer. There are far too many variables for that question to be answered here.
yes
Back child support is paid until paid in full, regardless of the age of the child.
No. The money isn't for the mother. The money is for supporting the child. Back child support belongs to the estate of the deceased and will eventually benefit the child. And even if the child should die, the back child support does not go away.
I doubt there were many child support laws back then. Normally, only the custodial parent of the child can file for child support, not the actual child.
Yes, if a parent owes back child support, they will have to pay it until it is zeroed out even when the children are grown. The age of the child does not affect back child support at all.
all i want to know is how much should you get back pre child
Can I get a Twic card owing back child support
That is dependent on the custody orders.
The parent.
Yes.
No, you are not responsible for their back child support.
The only way birthparents could adopt their child back is if the adoptive parents put the child up for adoption and agreed to give the child back to the birthparents. Once the child is adopted, the birthparents cannot force the parents to give the child back.