My thinking is to get Son and Daughter together and just hit him head on one night :
All three of you sit and say to him OK, this is your choice
a.Work on the marriage and make a 100% commitment to put forth the effort - no exit activity and no exit talk whatsoever b. Leave now and not be a part of this family any further
That's a rough choice, but with all three of you staring him down with a rough exit like that I would like to think he would cave ...
He probably would. I'm not sure if D and S16 could handle it. I could talk to them. S14 I know would not be able to handle it. He's very concerned about not showing partiality to either of us, and that's OK. As I said - with his Aspergers, I don't expect him to be part of the tough love campaign.