Pete and Sam have been greatly enjoying Guitar Hero 2 (Dad's Father's Day present) and Guitar Hero 3 (Nana and Poppy's house, pictured).
Based on the picture, Sam is presumably playing "Shout at the Devil".
Pete has surpassed Dad in ability on GH 2, which Dad is bittersweet about. Pete has completed every song on Easy and Medium, skipped Hard, and is now working through songs on the "Expert" level.
Sam is also doing great - he has recently finished a number of songs on Easy level - using only his thumb for all notes on the fret.