Some good news from me: the rift with my son has finally been healed, and he and his fiancee came to dinner the other night. It was a bit stiff at first, but finally we all relaxed. The whole thing started last August - it took 6 months and no end of diplomacy from me, to resolve it.
In fact, it had cast me down into deep depression: I haven't been terribly successful in the material aspects of life, but I didn't care because I had my family, and I knew our sons were doing OK. But suddenly there was this big rift, my marriage went shaky because of the blame game, and my whole life felt worthless.
I'm OK now, but I now realise that I have to accept that adult offspring, and also spouses, can be arseholes at times, and it is not my fault and not my failure.
The kids are now adults, we got them through university and beyond, they got settled into their homes and relationships, and have their careers. Our parental work is done, whatever happens now.