Three player coop games

[strumpusplunket]

The Ascent is another one to maybe consider - fulfils the RPG/shooter requirement, although it's top-down isometric rather than FPS/TPS, lots of nice effects & OTT explosions though

Or for something completely different - what about Keep Talking and Nobody Explodes? If you take it in turns to defuse vs instruct

I finished The Ascent and thought it was pretty decent, but maybe not to the extent of wanting to play it through again even in coop. I like the idea of Keep Talking, but the kids are more likely to put time into something with a bit more action.