My situation is much the same as yours except OW is same age as H and they went to school together and had a date or two in high school. I am 7 years older than they are. H's MLC started at least 2-3 years ago but he didn't move out until about 16 months ago. A started about 4-5 months ago. But the getting shunned and really never completely cutting off from us is about the same. My friends all tell me that I am doing great considering the circumstances. H brings OW to every one of S17's football and basketball games. At first it was to spite me and now I truly believe it is OW that insists on coming. Few people have much interaction with them.
I am standing by my marriage for as long as it takes but next month our D will probably be final.
Everything happens for a reason, maybe Dad needs to find that it isn't better out there, he needs to realize how good he had it here. Maybe he will find God and that is the most important thing when he finds Him he will know he is supposed to come home.
