Wow Beth2011....you're analogy is right, sometimes it really does feel like a family member passed away.....I felt that too....luise once said something like that we miss & grieve for the person they used to be....that's the truth of it isn't it.
Whatever it is though that your DS is harboring, it doesn't end with just you.....for him to treat another this way that was the acquaintance is just his issue....your DD seems to get it and she sounded embarrassed for his behavior....but at least this person knows that DD doesn't feel this way and that they were not raised this way.....
Also, that book "The Language of Letting Go" is by Melody Beatty (not Melonie as I first wrote) . Sorry. I am sure a library would carry that or at least locate it and get it for you. We have a library here that actually will order from another branch to get what is requested on our side of town....just a thought.
diazdebbie, I am glad to hear DIL is still making efforts....I would hope that your DS going to church would help him get past whatever grudge he is holding.....I hope he doesn't continue with it until it's too late and something happens to someone (like a death)....life is so short and when tragic things happen, many say their grudges seemed so petty, but he will be the one to live with it, not you. Keep hope alive....there is always that.