Michael loved his dad very much. You didn't have to watch him the day of the funeral to know that. Ron and Patti seemed to have been there more for moral support for mom, than anything else. I suppose that's a bit overboard, but it strikes me those two were some pretty cold fish when it came to their dad.
Over the years it seemed clear to me. I guess it is possible they reconciled with their dad.
I wondered about Michael not being in the room when his father died. I did hear one newscaster say he was on his way there... I think perhaps he was in traffic or something. Of course, I don't think his father's death was really sudden, but there seemed to be some conflict as to when it was realized that the end was near. Where does Michael Reagan live, anyway? In California?
Mike was not there because he was stuck in traffic trying to get there. Guess she forgot to tell that part.