Years ago, I was in a relationship with a guy - we were both students at the time. We went to visit his widowed dad who lived a couple of hours away one Sunday. We weren't sure what we were going to do, so I made up a bit of a picnic to take with us - just some sandwiches, crisps, fruit and a flask of tea.
When we got to his dad's place, it was suggested that we went out for a bit of a drive, so BF, BFs dad, BF's brother and I piled in the car, and our drive took us to quite near where BFs other brother lived (lot's of relations here!) It was in the days before mobiles (old gimmer), so we stopped off and bought a cake, etc. to take with us to visit the brother, sister in law, and their little one. When we got there, they were all out in the garden, as it was a lovely day.
We stood and chatted for about 15-20 minutes, when it started to become apparent that we were not being invited in... Now, I know we had arrived unannounced, but this really was the norm in the family - we had surprise visitors a few times ourselves, whilst I was living with this BF. We were there for almost 3 hours, and at no point were we allowed to sit down, we weren't offered so much as a cup of coffee, and when I needed the loo, it was suggested I went down the road to the pub! BF actually took out our picnic in an attempt to shame them into offering us something. Nothing....
Our flat is often untidy, with laundry hanging about, etc., but surely this place couldn't have been that much of a tip that I couldn't even be allowed to use the loo!! BFs dad was so mortified by this son's behaviour, he took the rest of us to a restaurant for dinner, and didn't invite the brother, sil or child. In the 5 years I was with said BF, we only visited once more (pre-arranged) and were only offered one cup of tea each in a 4 hour visit. They were very strange, and exceptionally mean!
It's largely why I now constantly offer guests food and drinks at our house!!