yes you both will have to agree and then go back to court
Generally, yes, the child is still his child. The support payments would likely stop if the new husband adopts the child, but he can't do that unless you agree to it.
You can file a complaint for child support against the father in the family court in your jurisdiction. His wife has no obligations to your child whatsoever.
With approval of the court.
generally, no
She can't either way. see link
The college expense is a gift unless addressed by the courts in the child support order. If she wants to stop paying the child support, she has to petition the court to get it approved. see link below
yes
no
no
If you mean, the child's mother (ex-wife) has custody, the child's father (ex-husband) is obligated or potentially obligated for support.
no unless he can not support the child
No. Child support is paid by absent parents.