L.G.
I think sometimes caretakers of children (grandparents, babysitters, etc.) are assumed to not have the same disciplinary "rights" as the parents. I've recently been reading a book that says that whomever takes care of the child ought to have the right to use discipline. Usually, it would be a good idea to talk it over with the parents. Even if the caretaker of the child is a 10 year old older sibling, if they aren't able to correct bad behavior, it's not fair to the 10 year old or the younger child because the young child learns that "the law" only applies when the parents are around. I have witnessed first hand grandparents that seem helpless when it comes to straightening out their grandkids and I feel so sorry for them because they probably don't feel they have any power to instill what is "right" in their grandkids, and that should not be. I hope you're able to have this discussion with the child's parents so that ALL of you can be responsible, in part, for raising a sweet child.