The article provides some possible boundaries that parents could establish for their children. The point about privacy and personal space stood out for me as that is important even for the child to establish their idea of self.
Sibling rivalry is an important issue which requires attention. It is important for the parent to be mindful and not reinforce the behavior of the children in times of quarrel. Both the children must be educated about the importance of personal boundary. Moreover, in most of the cases, the parent usually expects the older child to compromise; more attention should be paid on collaboration by both the children than compromise by one.