I, too, have had to deal with OW every week at sporting events until S18 told dad he didn't want her there. But college football is starting I know she will be there again because they now live together and son seems to be accepting his dad's relationship.
My situation was complicated by the fact that OW was a friend of ours that we hung out with and H and I had been separated for almost a year before they started seeing each other. In fact, she sacrificed her marriage for a chance to be with him. They had went out a couple of times in High School and apparently she thought of him as the one great love that got away. So my point is a lot of our friends were torn between snubbing her and being friendly with her. I understand how they must have felt, I wouldn't have wanted to be in their shoes. I have lost friends over it and one of my best friends is still stand-offish with me because her H and mine were best friends,too and she was best friends with OW since she was young. She and I had only become close in the past 10 years. Oops, I went on too long again. The point being it still bothers me to have to see them together every week. But I have to get used to it because I have no control. My H is not as considerate as yours...not even close.
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.
