I've been letting the guy play Thank Goodness You're Here, which is an adventure game brilliantly designed to keep the humor delivery flowing and not be frustrating, which pretty much all humor adventure games have a problem with. It is, in general, incredibly smooth.
This, though, is maybe one time I should have checked the ESRB rating? It is rated M for mature for crude humor. It wouldn't have changed my decision, I think but I wouldn't have been surprised by the uses of "shit" and various innuendo.
There's Britishisms that will go over American kids' heads. The convenience store is called Price Shaggers. Then, there's grown-up-isms like the fish monger's face turning red and "saying Reggie's wife could learn a thing or two!" when you spin around a phallic-looking fish. And I think there is a "I couldn't walk straight for a week" joke in there.
Anyway, the important thing is that there isn't any nightmare violence. Although there is a creepy meat-world and lots of surreal gentle grossness.
Back to the way the game plays, it's very skillfully designed so you don't feel like you're pressing A to advance a pre-scripted movie, but you also don't feel like you have to stop enjoying the characters in order to solve a disparate puzzle, whether it's well-designed or poorly designed.