When you become a parent, you look at your parents differently. You look at being a child differently. It's an awakening, a revelation that you have.
When you have a child, as anyone knows who has them, that's basically all you want to talk about.
I have three children and I think I'm happy when I'm with them and they're okay. When I see them enjoying each other in front of me, and then they let me enjoy them in turn. That brings a feeling which I would say is happiness.