I would yell NO! It doesn't mean a lot if the parents are there. Some parents go to bed and couldn't care what's going on. I worked with kids for many years and they need you to be the Mom and not their friend.Stand firm and let them whine all they want. Tomorrow it will be something else.Don't feel guilty for being a single parent. As I tell my daughter it doesn't matter single or married they always learn to push you to get their way.