How do I modify a custody petition?

Go back to court and ask them to modify your petition.

Can my sons mom take my son and leave the city or state? We have never went to court but she really doesn't let me see him.

Go to court and file a petition for visitation but once you get it follow through and show up for your child or you will lose it.

I'm filing a lawsuit for emotional damages (see explanation). Are there any lawyers who would work for a % of the winnings?

None that I know of. Not easy to find on such a difficult cause of action.

If I have herpes can I sue her? What would I need to prove in court that she gave it to me? Would a audio/video confession help?

If you have a taped confession that will help your case. A text message would be even better.

What happens when my ex wife refuses to comply to court order and does not tell me where she is working

File a violation and enforcement petition.

Can a person on probation live with someone with an order of protection against them ?

If any of the orders of protection are against your brother or his girlfriend and for the protection of either against each other then they would...

A federal judge gives guardianship of a child 2 a grandparent, does she have to go through local courts to take custody?

There is not enough information here to provide a proper answer. She must take the order to an attorney who can read it and tell her how to proceed.

Does he have any rights?

If he establishes paternity then he will have rights.

There may be a warrant for your friend. Or a parole hold.

Will i be able to get full/sole custody of my son?

If you live in New York and the child does as well then any petition is filed in New York and not Texas. IT sounds like you are the primary...