Hello. I have 9 and 11-YO daughters. I was so excited to have two girls and envisioned them being best friends growing up together. Not the case. They fight all the time and my 11-YO has become quite the bully. Just this morning she got mad at her sister and told her "You have no friends". These words and this behavior worry me terribly. I have seen glimpses of this with her friends too, it is not just limited to her sister. Of course she is grounded, but I have seen this behavior escalating for months. What can I do to help her see that this behavior and her words will never be allowed and are not acceptable?