The Supreme Court Case of In re Stephanie Lee confronted whether the Mediated Settlement Agreement of the parties could be revoked. In that case, dad wanted to get out of the agreement. He told the judge that mom was living with a registered sex offender, who was sleeping in the nude in the bed with mother and the child. The trial judge set the agreement aside. The Supreme Court said it was enforceable. Dad knew about the sex offender when he signed the agreement.
Moral of the story? If you sign a mediated settlement agreement, it is probably final.