I feel as though this thread is going off on a tangent from what was posed initially.
I have personal experience of losing a sibling. It is horrendous. I have been left to feel that the sibling who died was the favourite, that the siblings left behind are the ones who should have died instead. It is not what is said, but how you can be left feeling with the actions of those around you in the aftermath. The death of my sibling undoubtedly drove a bigger wedge between my mother and I and it has not changed the relationship between my father and I. Regardless of the cause of that, some hurt cannot be undone, and people should not feel forced into counselling. It makes me quite uncomfortable reading some of the posts on this thread suggesting that the son should be doing more. I think it’s fantastic that he has a relationship with his father still and is enabling the same with his child, as opposed to having cut both parents off.
Essendon, I think it would be a huge blow to your son if you were to stop contact with your GC. It would also put undue pressure on him, making him feel that he has to choose between a relationship with both his parents or none. I can imagine that it must be difficult for your wife, but the relationship between your son and her is separate to that of yours with your son. I would suggest not sharing details of your visits when you see your DS and GC, your wife will know obviously but I think more information without being able to be there could be more painful for her. Has she sought counselling, to help deal with and process the current situation? Perhaps that could help her to figure out a way forward, either coping with the situation or trying to make amends with your son.
It must feel awful being stuck in the middle. Ultimately, our children must always come above our spouses providing there is no criminality or abuse, which I don’t believe there is here from what you have said.