All I know is I saw my kid in pain last night and that hurts but he's becoming an adult and he can and needs to deal with that. His relationship with his father is between the 2 of them.
I think that this ^^^^ is the most healthy way to look at things. At some point your son needs to step into the role of an adult and try to work the relationship with your H. It is not something you can influence, one way or the other. You can maybe dispense wisdom if your S asks for it but in the end you are probably best served by staying above thew fray.
Me51 W53 S17 S14 M22 T25 Bomb-9/11; A-11/11; I move out 11/11
It's easy to find our bottom, it is our top that requires cultivation.
Every rough spot adds to our emotional constitution. -Barney Fife