|Your X sounds like a d!ckhead.|
OP, you said your son might regret not going if he chooses not to..... What is it he's supposed to regret???? Parents should never put a statement like that on a child.
She was not for a nanosecond trying to guilt trip her son into going but sometimes we do regret things when we are older. I for one wish I had appreciated my grandmother more and that I had paid more attention when she talked about family history. Might not have made a difference if someone had mentioned this to me but what if it had? I was unable to go to the funeral of my brother's friend when I was in high school. For some reason my mother was adamant about my not missing school, which was retarded, more than half the school went to the funeral. I always felt badly for not having said good-bye to him in that way.
To me telling a child he/she might regret something is really asking them to think about it and consider how they might feel good or bad if they don't attend a funeral or something else they choose to either do or not do.
Kudos to you for taking a moment to acknowledge her passing since your X made a poor decision about handling things. Your son could have stayed and been driven or picked up Monday evening, putz.