When they're little it's a ton of fun. Then they become teenagers, it can become unbearable and you ask yourself, "why?". 

During that whole time, you think you're teaching them... But then they become adults and peers. That's when you really see how much you've taught each other. 

It's the natural progression and it's a beautiful life. 

About to watch my first get married. We were pretty sure we broke that one. But they turned out better than we could've hoped for.