Perhaps I can give a different perspective. Many years ago my ex went off with someone else after a period when he had been so difficult to live with. I had 3 children and remember my MIL as trying to exciuse his behaviour and wondering how he was going to afford to keep 2 homes going. I do wish someone had advised us to go for counselling. Perhaps it wouldn't have helped us stay together but it might have led to a less acrimonious split. So my suggestion to you is that you try to get them to seek help and support. That you offer to mind the children to give them time to talk. That instead of talking to them separately you tell them together that you want the best for both of them and you will support both of them no matter what. So that although they may go their different ways they will both stay important parts of your family.
Unite the Kingdom and Pro Palestine marches Cup 16th May 2026
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DD said it was terrible, everyone could see the messages between them. She wrote this woman a message and said how appalled she was by her behaviour. When BIL realised some people in the family were not going to sit back and allow him to treat his wife this way he stopped it. He really thought it was okay and was happy to visit her family when he knew they knew what was going on. I believe he will always be a cheater but they seem happy at the moment and while their children are very young that is what matters.