I was practically bawling on the mound the last time I threw batting practice to my oldest son near the end of his senior baseball season. Hard to throw strikes with water in your eyes. I sensed it wouldn't be the same after he finished the season, and left for college later.
It wasn't.
They're always your kids, but the impactful experiences are fewer after they're grown up. Life happens and they're building their own families.
Make the most of it while they're young.