Or should that say, do you fucking well swear in front of your PIL?
It struck me recently that DH never swears around my parents. Even though they’re Irish and happen to swear rather a lot - especially my mother. And then he told me off for swearing in conversation with FIL. (It was a conversation about Brexit - how can one bloody not swear?!)
We agree on swearing around kids (not okay) and at work (okay with colleagues in our workplaces but not around clients) but not on this one.
If you don’t, then I only get it if they’re vicars or something. (Though I know some sweary clergy TBH.) But why should some people being a generation older and progenitors of your spouse mean you shouldn’t talk like you might around other adults??