SA, In their warped little minds, they feel that they have had to put up w/alot of things over the years both from us and everyone else. They stuffed it all down and never once piped up to say how they felt about things. They feel that they have given it all to everyone else and they never got to experience or do whatever it is they think that they missed out on. They forgot...they had a voice in how they lived their lives...
They become upset and angry because things didn't turn out the way that they thought they would be. They thought we would roll over and allow them to take everything from us. They thought that thought that they could just walk away and not have responsibilities barking at their heels all of the time. The grass always looks greener over on the other side of the fence until you cross over. The illusion is always in the distance and it looks great, but once you get there...it's another story.
Sit quietly, the answers will reveal themselves when you least expect them to. The past is gone, the present is a gift and you need to focus on today, allow the future to reveal itself when it is ready.