I also disagree with Lola's advice to confront the person, especially a parent, who "done 'em wrong" in their childhood. If their relationship is a good one currently, all the confrontation does is put the parent on the defensive and they're likely to react badly, which doesn't help. And what if that parent has passed away? I think the idea mentioned earlier of writing a letter without sending it would be a better choice in a lot of these cases. I am no expert, though.