I really like the story.  I wish I liked the illustrations more.  It’s not even the illustrations themselves I object to, but I’ve been noticing a trend lately in too many picture books that I don’t like:  the only word I can find for the color scheme is drab.  The story itself is great — it’s so many elements that so many folks can relate to: moving to a new neighborhood, wishing for a tree house, father-sons bonding activity, brotherly bonding, little brother’s remorse as big brother moves on to new interests/friends, community bonding during a summer black-out, reconnecting.  I like the use of silhouette, but I just can’t get past the drabness of the colors in the rest of the illustration.