Well, now that's a different can o' worms you've opened cause if my kids were going into a home where there's a man with DV convictions with 2 wives, I'd be speaking up. Even verbal abuse is damaging for kids to hear on a regular basis. Your W has made her choice and she's an adult, her consequences are hers. The kids are a very different matter.
That's not being vindictive that's providing for the safety of your kids.
I would be having an absolute cow about this. I wouldn't want my kids around this person for any length of time. I am possibly an over-protective Mama Bear, but that's how I feel for sure.