My BIL, SIL and their 4 kids will visit often, but almost ALWAYS in the evening, just in time for supper - unannounced. This drives me crazy!
Either I already have dinner (for 4) prepared and we end up putting off our own dinner to host them and then try to hint that its time for them to go, or have to make something else so we have enough to feed everyone, which is often a scramble since there are 6 of them.
BIL is always 'oh, you don't have to cook for us, we'll eat later', but their kids are hungry and they usually stay late.

And all that makes me a not-good host since I'm always so annoyed!