HHow too stop a legal separation if just got served but not signed by judge yet?

Find a local family law attorney or use your local court forms and guidance. Also try legal aid.

Can an unbilological dad take custody of a baby with his last name, he's also not on the birth certificate?

You need to speak with an attorney in your state. This is unlikely but again, you need clarification with a local attorney

Depends on what state agency, their website usually has that information or you could call and request it from them.

What does OOC stamp stand for for the green card holder reentry?

Contact USCIS customer service for more specific answer.

I need a divorce who practices in king county, washington and in anchorage, ak. can you find one for me?

I am licensed in both states and practice Family Law. Let me know if I can be of assistance.