Coco had been whining and arguing about all the DS cartriges Madge was getting for her birthday. It wasn't many, but he saw each an every one as a personal slap in the face.
Yesterday the girls went out to use some gift certificates - yes, it appears that fourth grade is the beginning of certificate-giving, mostly because the birthday child's wants have already been met in multiples (how many doll clothes does one girl need, for example - don't answer). When they returned it turned out that Madge had used her certificate at Gamestop to buy her little brother a game he wanted.
(Of course any more advanced game needs to be played by her first, not only because his reading skills aren't up to par for the games, but also just because. Still, awwww.)