Technically yes because they are still your responsibility, but on the other hand, if they don't want anything to do with you, it would be hard to want to and try to support them. How are old your kids? And im sorry to hear that they don't want to see you, I know that's hard.
In the US, no.
Only if the child is still under 18.
You can attach the estates of him and his parents
Anyone can, but can't be required to.
No. If the father is not paying his child support she needs to file a motion for contempt with the court. She cannot withhold visitations on her own. Visitations and child support are two separate issues.
Yes, if a current case exist. If not, than no.
Yes although if he has abused the children or you then you can get either no visitations or guarded visitations where a relative or friend oversees the visit for you.
yessee related link
The courts will mostly likely consider a child who enters the military as "emancipated," and, therefore, terminate child support. But don't stop paying on your own!
You may ask the court to award a judgment for interest.
Your Social Security eligibility is not affected by your receipt of child support. One is for you; the other is for your child.
yes see link