Those are suitable for younger grade school kids, such as Sarah. Sarah could play both of those, but Todd would get a lot more out of them. To be honest, though, I wouldn't get too carried away with educational games. This is a kid's version of the super-popular adult game, Sim City. Sarah could build and manage a town, right down to the garbage man doing his rounds.
Several companies produce sing-along type games.
Fisher-Price has Elvis Pigsly in their new game, Sing Alongs, while WordPerfect has a cute game called Kap N Karaoke. These games are on-screen versions of a karaoke machine. By now, his dancing is faster. Then he stops. She's a girl, she's 8, and that means she likes Barbie.