Remember this, your little boy. Riding down your block, bright red shirt, 23 in big white letters against the green grass and apple blossoms. Training wheels still banging against the sidewalk. The moment you got to spend with him, before he zoomed off ahead of you to get to his brother and the house he will remember growing up in.
Press it into your brain, like a flower in a heavy book, set to fall out at some moment. Reminding you of the sweetness of the bloom so long after it would have been otherwise forgotten. Remember that all the things he did had firsts, and this was one of them.