Child custody ?

Your lawyer would be more familiar with the current procedural posture of your case, and would be the best person to answer this.

It is possible that he signed something without your consent, but his signature alone wouldn't invalidate your custodial rights as the mother.

You start the process by hiring a lawyer to file for custody in court.

It's not illegal in the sense of committing a crime, but it is a violation of the rules of professional conduct concerning conflict of interest.

Neither a postive nor a negative DNA test in a civil case would result in self-incrimination.

How do i go about getting a fathers name off of the birth certificate if dna is proven he isn’t the father?

It's not a unilateral process. The biological father would need to establish his paternity before a name change could be successfully requested.

What steps do I need to take in order for my child to receive benefits if the father died before the birth/acknowledgment ?

You need to hire an attorney immediately to file in court to establish paternity.

Can I get temporary if not permanent custody of my neice and nephew?

It is possible that you could be granted custody. It would be advisable to hire an attorney to fully evaluate all the facts of your case as well as...

My son is 4. I do not know who the father is. How do I terminate my rights and give custody to my parents?

Your parents can hire an adoption lawyer to file for adoption of the child.

What can i do as a father if my newborn's mom wants to give up her parental rights?

She can't give up her parental rights unless someone is adopting the child. A lawyer could prepare a consent judgment granting you sole custody.