Sorry for the wait, here are some you can try.
Postman Pat
My Neighbor Totoro
The Rescuers
The Lion King
Mary Poppins
Bob the Builder
Lady and the Tramp
Winnie the Pooh
Madagascar
A Bug's Life

I'm sure you know many of these above and I chose them as they may be your safest choices for a little one, plus I grew up on most of them myself.
Here are some links you can check out for more animation classics and recommendations. Note that some may be better suited for when the little one is a bit older, but that depends on how easily things scare him.

http://www.imdb.com/list/ls058028927/
http://www.imdb.com/list/ls054498912/

*edit
You can always use these movie names and just add game to the search or type the name in steam and you should find a suitable game for your son.

http://store.steampowered.com/app/319400/

Hope this helps :)