It's two very different situations though. His father, who he was close to, died. He very much wished his dad could have been there, and that's the way they chose to honor him. His mother, though, he is estranged from. For whatever reason, they aren't speaking. A wedding is for the bride and groom to enjoy, and if they didn't want someone there that would cause them distress, then she shouldn't be there. I don't think there's anything wrong with that.