I gotta respectfully disagree with everyone that say ugly niggas solution isn't valid. In fact for me personally I think it would be the only solution. Assuming the scenario in the op is all the info, there's no way that myself as a man could stay with that woman, and yet there's a major reason for them to stay together, ie the family. So really a deal must be struck, with whatever terms are acceptable, that allows both sides to purge all the animosity they have and will have, and then basically start from scratch. I speak as a married man to a loyal woman with a son on the way, but knowing personally that if she ever cheated on me (let alone had a baby with my friend) I would not be able to stomach it and would have to leave her but would be torn apart with breaking up my sons family.
I in no way endorse ugly nigga puttin a hit out on evergreen and then snitchin tho that was sloppy