Is my ex allowed to have any contact with my mutual friends if I filed a PFA against him which got granted?

Yes, he can have contact with anyone not on the PFA as long as these people do not harass you on his behalf

Can you get harassment/restraining orders instead of a PFAs in Pennsylvania?

You can try and press charges or file a private criminal complaint against her

Can you have a mentally retared person sign an agreement with the courts

An attorney would need more information to answer this question

My ex wife has had no contact with our children for three years. can I have her parental rights terminated in Pennsylvania?

Grounds for involuntary termination - 23 Pa. Cons. Stat. § 2511: http://law.onecle.com/pennsylvania/domestic-relations/00.025.011.000.html

My uncle bought me a car, and is threatening to cancel the order if I don't sleep with him.

Call the police

At the age of 13 almost 14 can my son choose which parent he wants to live with?

Custody is a privilege not an obligation. The law cannot make you raise a child

Absolutely not!

I got aressted for use / possession of paraphelia but wasnt read my rights but when we got to the police station

If your rights weren't read to you and you made an incrimination statement, there is a possibility of suppressing the statement

I think in order to go so far back, you need to do your own research

Is there a statute on how long I can sue a company?

I am very sorry that this happened to you. However, the statute of limitation in PA for a minor is 18 years + 2 years from the date of the accident