Here’s a website your boys might enjoy. PBS Kids. It’s got a range of games from preschool to elementary, based on the various children’s programs that PBS produces. In my experience, it’s really one of the better children’s websites out there, and they don’t try and sell you stuff (which is a problem with the Nick Jr site, which A1 also loves for the games [Dora, Blue's Clues, etc]).

A particular favorite for A1, who is four, is Cyber Chase. It’s really for older kids who have basic math skills already learned, but he loves it anyway. The games there are much more of a challenge without being impossibly difficult, and of course he’s got good ol’ Mom to do the really hard stuff and show him how it’s done. I think your five year old would really enjoy them, insha’Allah.