The older one only wants to play co-op because he generally doesn't like to lose. The younger one only wants to play competitive because he likes to kick ass. It's tough finding something they both want to play. Between the NES emulator (Raspberry Pi) and the PS3 (Ragdoll Kung Fu, LBP Karting) they have some good choices, but the PS4 options have been slimmer. Basically they play It Takes Two, Minecraft, Quake, and a shitload of Brawlhalla.