Parenting tip from a 23 year old stepmother: No is a very powerful word. Unless you never use it until your child is like 10 and they don’t understand the concept of no when applying it to their own lives. And then they do whatever they want to do all of the time. And you find  yourself trapped in your room on Sunday morning because this child is sleeping in the living room like EVERY OTHER GOD DAMNED NIGHT even though you have expressed how much this pisses you off because you shouldn’t have to be trapped in a room because someone else refuses to sleep in their bedroom.