What do I think? I think AITA is the most dangerous online location since 4chan. It's like a black hole into which the hapless reader is likely to vanish, so intriguing are the scenarios & dilemmas. I'm honestly grateful to have been banned from posting (under my principal Reddit account, that is;) for suggesting, entirely in jest, a wronged SO hire a hitman.

Seriously though, not sour grapes. I still spend way, way too much time there.

Re: the bride-to-be, I think she's right. Perhaps the best approach would be to plan a small get-to-gether where the son could show the Powerpoint & people who knew her could celebrate her life.