I am new to this product so maybe someone can give me a hand.

I have a diagram where I need it to display in two different ways:

1. I have a key node, I want to show ONLY my parent nodes and my child nodes.
2. I have a key node, I want to show my parent nodes, my child nodes, and any cousins (child nodes of my parents)

Is there a way to iterate the diagram nodes and selectively show the diagram in one of these two ways?