Are they still into cartoon films?
I will never grow too old for Robin Hood, the cartoon version where RH is a fox. Sadly, I often hum the theme to myself even now!
Also, George of the Jungle is good, but depends on if your kids are able to follow a quite long plot?
I know kids these days tend to turn their noses up at classic oldies, but how about Chitty Chitty Bang Bang, and Bedknobs & Broomsticks?
The Ice Age films are really funny too.