So sorry for the loss of those mementos as well as the damage to your property. IMHO, you are doing just what you need to do, making your brother accountable for his actions. As for your sister - she will just have to deal with it.......he didnt do this to HER, he did it to YOU. I am glad your friend will go there with you, giving you support especially when you actually see what has been done ! Good luck to you, grieving over these losses IS hurtful. Take care of YOU through this time!