That makes sense, family; I'd be surprised if you didn't mention it.
I don't have kids so won't get to experience the empty nest anxiety some parents do however I guess what's great is to see them progress, get out on their own and succeed and to welcome them back from time to time. I think that'd be a rewarding feeling.
Oh yes, my oldest is doing great and it has been so rewarding to watch him grow and experience the ups and downs of adulting. With the youngest, I am suree it will be the same feeling. It is more about the wife and I learning to live by ourselves again. It is a rewarding feeling like you said, but weird feeling.