excellent, my favourite ranty topic.
rule no 1: when you come to stay with your family, pack some stuff. Don't arrive with NOTHING and say 'oh we'll just borrow yours'. Don't assume we have spare waterproof jackets, wellies, gloves, car seats, swimming costumes, for all of you.
And my favourite: when your children get up, you get up. Don't shove them out of the bedroom for us to look after, and go back to sleep for two more hours. And no, it's not cool to say 'I'm going to take a nap' while I am slaving in the kitchen cooking your roast dinner.