Crazz's grandfather died 3 days after DDay. I had to hold my infant daughter on my lap in the home as his grandfather passed, and console not only WH but his family who had kicked me in the teeth every opportunity they had.
Looking back, I'm glad I tried to offer support even though I was in a tornado of emotion. That's the kind of person I want to be - unconditionally compassionate.
You don't have to be there for him, but if you have any compassion to offer I support you trying to offer it. This is likely going to compound your feelings instead of distract you... whatever you do be kind to yourself and know that you can only do what you are able to right now. It doesn't make you any less of a person if you need some space.