Nephew may have to become a cuckold

Advice needed. My wife who cucks me, has a nephew who is married with kids. His wife who is in the military has asked to be deployed, with I suspect her boyfriend, and has seen several guys during their marriage. Even one kid is suspected to be not her nephew’s. The nephew left with the kids for a period of time because of this but is returning to his wife to keep the family together. Everyone knows his wife is going to continue seeing other guys. But he’s going to do whatever it takes to preserve his family and keep them together and out of poverty. Here’s my problem. I am not that close to him but I’d like to be supportive. I know what he’s about to go through because I went through the same thing. I told my wife I’d like to reach out to him and talk with him. She’s dismissive and literally said, “I don’t know, you’re not that close to him”. I think a woman who cucks their spouse really, truly has no idea of the mental struggles a cuck goes through. Any advice would be appreciated.

Update:

Most common advice is to stay out of it. That’s what I’ll do. I sympathize with the struggle he’s about to go through because I went through the same thing when my wife cucked me. When I went through it, I would have killed to have someone to talk to and give me advice or warnings of things to come. Please, everyone pray for the new cuck. 🙏