We've been invited for a sleepover at my sister in law's house. However, she's asked that we bring sleeping bags and pillows for my two children which I find very odd. They live in a big house with plenty of space and live comfortably so it's not that they don't have spare bedding. My husband says that that's the way they were raised but they've stayed with us and I've never asked them to bring anything! And when I've been invited to other people's houses I've never been asked to bring bedding. My husband is furious because I am upset about it so that I don't want to go anymore. Am I being unreasonable?