(Blurb says heartbreaking, but that's not quite true. Don't be warned off; it's also heartwarming.)
This is a reread for me. In the Children's Books group, in June 2020, we are discussing 'books with a summer theme.' In the discussion we had just despaired over the bad behavior in *The Penderwicks* and I posted this:
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Otoh, one of the main themes in Sun and Spoon is honor & duty. Spoon has a very strong conscience and really tries hard to do the right thing, by himself, his little sister, and his widowed grandfather.
I reread this now because 1. it's Henkes and 2. it takes place in summer. Turns out that viewing it 'through the lens of' the summer setting revealed more explicitly a lot of depth in the story. For example, because it's summer, the annoying big brother is away on a trip and only part of the background. Because it's summer, Spoon's parents (who are teachers) are spending all day in their garden, growing & nurturing both flowers and vegetables (you see the metaphor). Spoon and his sister have more freedom to walk over to their grandfather's home, or squabble, or find projects to do together, or seek privacy... lots of time for Spoon to figure out how to become self-directed and how to get along with the more extroverted 5 yo. The summer setting is almost like a supporting character in its own right.