BG: My dad comes from a European culture in which it's customary to open your home to any and all extended family members (and let your adult kids live with you indefinitely). My mom does not.
Story: When I was about 4 or 5 years old, right before Christmas, the doorbell rings. It's my dad's brother's estranged wife and her two teenage daughters. They've just flown in from European country, and they've come to stay in our 1000-square foot apartment with us. They didn't think to call in advance to make sure we had other plans, or even wait for us to invite them over. Anyway, two of them slept in a full-size bed in my playroom-turned-the-guestroom, and the third slept on the couch. My parents footed their food, transportation, and entertainment expenses entirely. They ended up staying three weeks.
My dad's brother - the wife and father of the guests in question - also lived nearby at that time, in an apartment by himself, but of course they couldn't stay there....
And we've had many other visits from my dad's European family over the years, but while my parents still choose to take care of their lodging, food, transportation, and entertainment expenses, at least the rest have announced their visit in advance (though pretty much all of them have invited themselves over).
To be fair, we have flown to European country a few times in the last twenty years, and we have stayed in the spare farm home of one of my dad's sisters. However, we rent our own car, buy our own food, and foot our own entertainment expenses, so we try to pose as little inconvenience to others as possible. And we have waited to be invited; we don't just invite ourselves over.