Not the parent - I'm a brit - but the obvious example I'm aware of is aussies' casual use of the c-word. It's used much more frequently than it would be in USA - or even the UK - but often in a complementary/friendly sense.

Yes - that was the example that I was going to use. That's pretty much the worst single-word swear you could use in the US and it's basically nothing in Australia (and pretty common in the UK).