I agree, and I commend you on this post! I had two such brothers, and also a very protective father, who would have done the same thing for me. Only difference is, if it had come to an actual fight between them, my ex would have been long in his grave by now.
I do not know what Misty's role is in this, whether she misled her family, or just changed her mind. But the thing that really puzzles me is the RO against her brother. Having only been married for a few months, it is odd to me that she does not still feel a sense of loyalty towards her family or why she would want to risk the chance of not having them to call for help in the future. She seems to be rather isolated with only Ron's family around her. No matter how much I loved my husband, I would still want to have my family's support and love, I would not want to alienate them in any way.