As IA said, the Lego games are great. Some are better than others though. I have all of them I think (bar the new Jurassic World one), play with my OH. They’re light, entertaining gaming and full of humour.
The Star Wars I and II were early titles and are relatively rudimentary, though still good fun. Indy II uses an early incarnation of the hub system (where you walk around between levels rather than having a basic level select) and it’s an arseache (it’s the only one I regret buying).
What else… Portal 2 is amazing, though we got to a point where we got stuck. Should probably revisit that at some point. Borderlands 2 we completed recently, and currently playing Army of Two which is shooter designed to be a two player game but probably a bit heavy on the effing and jeffing for a nine-year old.