Very emotional stuff, and a very powerful metaphor in the can of rainbow sprinkles. It’s such a vivid image, of a child pouring rainbow colours over everything, which of course, is exactly what children do: they bring light and joy to our lives… and also mess.
The defense of the nephew in the second to last paragraph seems a little too vigorous: a bit of of place. There’s a mournful, desolated tone in the rest of the piece that kind of makes me think that these are old scars, or that the narrator is still in shock. So the exclamation mark and the strong, forceful sentences seem a little too high in energy for me, personally.
JayDee