I present it to the parents as a potential safety issue and/or explain that the rules in daycare are a bit different from home because I am looking after a group. the safety issue comes into play when we are outside for example, if I call a child to come in, etc. and he/she doesn't listen and runs the other way it is a safety issue. I also have basic rules about manners and saying please and thank you that I enforce depending on the age of the child. I think that you are doing the right thing in being firm with the kids and consistently enforcing the rules, but you will not be able to change the way the parents deal with their kids.. and maybe that's one of the best lessons that daycare teaches kids - there are certain rules to follow depending on the environment?