My son scored his first goal in soccer
I'm not even that into soccer but seeing his face light up when that ball went in the net was worth every Saturday morning drive at 7am. He ran straight to the sideline screaming and I might have gotten a little misty eyed. These moments go so fast man.
Those are the moments you remember forever, man. Not the wins or the championships, just that one time they did something they didn't think they could do and saw themselves differently after.
Frame this feeling and remember it when he's 16 and pretending he doesn't want you at his games. It'll hit different then.