After saving money to buy Mom the perfect gift, a collision with a roller blader destroys the present, and two siblings must think of another way to cheer up their sad mom. (The characters here feel very real to me, and the story brought tears to my eyes.)
Sammi gets a song stuck in her head at school and drives her family nuts with it at home. When she wakes up the next morning it's out of her head but in the heads of her family.
Everyone in Maggie's class is the "champion" of something. When she the champion of quiet choses other champions of not-so-good-things to be on her team she winds up making new friends.