1. I want to save this marriage to your daughter, I made a commitment to her and I intend to honour that. 2. There is an OM who is meddling on our marriage and it is next to impossible for us to repair anything while he is preying on her while she's emotionally vulnerable. 3. I have asked your daughter to end contact with him during this difficult time, but she has refused. 4. I would hope you can support our marriage here rather than a rush for divorce during a stressful time particularly while there is a third party covertly interfering driing your D to divorce.
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SG, if you KNOW this guy and her parents know this guy I am giong to suggest you even ask THEM to invite him to their house and have THEM tell him to get lost... That he is an interference and a distraction and they want him to STOP MEDDLING and to go AWAY
This puts OM in a very difficult position if they can do this. He KNOWS he has no future with your wife if he alienates the parents... You already outed him as an interloper... His goose is cooked.
He has two choices :
a. Honour their request and back off b. Sneak around more carefully
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You COULD confront OM directly on your own, but I strongly reccomend you invite her parents do do the confronting instead, its going to have a lot more BITE to it if you get my drift...