<human>: Can you provide a brief rundown of the text in within 3 sentences?

Throw away because I don't want to tie this to my other posts should my husband somehow find it.

My husband cheated and left to be with the OW who is also married with a kid and supposedly leaving her husband (who she kicked out) as well. I found out some disturbing (IMO) news that I think her husband deserves to know since it might benefit him in a custody battle but I'm not sure if this is something I should leave alone or pursue. 

 Apparently she was letting my husband sleep in the bed with her and her kid and while I don't think he's capable of hurting a child, it doesn't seem fair to keep this from the child's father because letting a stranger get in bed with a kid would really outrage me if I was a parent. Especially if there's a chance they had sex in the bed or room when the kid was in there. If there is the slightest chance it doesn't work out between her and my husband I hate to think who else she might let sleep in a bed with her kid. She is also trying to completely kick her husband out of her child's life which I find even more alarming given her behavior. Without any ammo in court he may not be able to protect his kid if he doesn't have much custody.

I know the best course of action is to talk to my lawyer first (and I probably will) but I wanted to know is it even worth it? It might cost me a lot of money to drag this into court so should I just leave it alone since it essentially is not my business or do I try to help the guy out? Any parents want to weigh in on how much they would want to know about this?
<bot>: The woman my dh cheated with let's men sleep in the same bed with her kid and for all I know has sex in front of him. Do I try to tell the dad or mind my own business?