I think our rules will always be different because we are dealing with a crowd not just a single child. Having said that there are what we consider basic rules that should apply everywhere for everyone and they don't seem to - the basics that result in showing respect for people and things, etc. I just use my stern or angry voice depending on situation and age of child and remind them that I don't care what the rules are at your house when you are at my house you will obey my rules and that means you will ..... whatever I expect them to do or not do. Kids can learn to have two rules and will have that when they go to school. Monday will be a reminder day and they get a second warning but the rest of the week they need to remember.