And since QC is a family-friendly strip...
It's not, like, X-rated, but it often takes me five or more tries to find strips that don't contain a swear word, sex scene, sexual reference, or dirty joke. I wouldn't call it family-friendly.
Jokes about certain activities causing families to exist aside, it depends on the family. I'm sure most of the sexual references would pass through a children's minds with only an occasional conscious nonunderstanding of what they just saw, and the more explicit parts might be gross but I don't recall anything that would be mentally scarring. I'm confident that children are no less inclined than adults to avoid stuff that makes them uncomfortable, so by the fact that there's nothing mentally scarring about
Questionable Content, I'd consider it family (at least for
my family) friendly, but by the fact that there are things that might make a child uncomfortable, it's not family
oriented. This is, of course, assuming the euphemism ``family'' meaning `something including children.' (The only problem I have with swears is their use as a replacement for more intelligible communication. If a person (child or not) understands the benefit of intelligible communication, even if inured to swearing, will choose to speak intelligibly---if intelligibility is the goal. The only problem I see is with immature persons (children or not) who sneer or guffaw at such words categorically, without considering their qualities relative to the context how it's used.)