I want to help my sister out. Her dd is 15 and this past year has just changed so much. She has started staying out later than the time agreed upon and just generally not listening to anything her or her dad is telling her. I'm actually worried for both of them as I worry about the dangers her dd could be exposing herself to by staying out late and lying about where she's going. I'm also worried for my sister as neither her or husband can seem to tell her what to do. Is this normal for a 15 year old ? I can't remember putting my parent through this ever !