Dear Bobby,
Anger can sometimes be a destructive emotion. But other times it can be healing. Also you can decide to go around the anger or go straight through it.
Is the anger about finding out about your third nephew related to your sister, parents, and your position in the family? Is it helpful to think about what is happening?
What would happen if you called him and met him for a sandwich at a place near you?
When I am having a strong emotional reaction to someone or something, usually I know that I can use that opportunity to learn about myself. (I don't necessarily make the choice to learn, but I am aware that I can -- because seriously, HOW MUCH LEARNING DO I NEED TO GO THROUGH IN THIS LIFETIME
??)
Hugs.
Mari