Just want to say that as far as the kind of songwriting feedback that this section is intended for (to critique lyrics, melody, arrangement, etc.) it would be very uncomfortable for anyone to want to suggest you change anything given the reason for the song and what it says about God's personal touch on your life. So as far as the song, the beauty of it is all in the memory of your son and the One who heals you.
Beautiful tribute for your son, and God's comfort
So sorry for your loss