I don't think mediation is binding. Arbitration is.

Can I have signed mediation agreement overturned/broke by judge ?

Mediation is not binding. Arbitration is.

My sons father has been absent for over half his life, I wanted to know how I go about revoking his rights.

An attorney could help you think through all the issues this would entail including the rights your son has to know his bio father. What may seem...

How long can child support be delinquent before taken to court.

I wouldn't test it out. If struggling to pay there is always mediation to try and work through a hard time or layoff.

Can a Notice of Judgement be amended?

This should have been caught earlier. Did you put anyone else's name on the petition besides Jiffy Lube?