<font color="#000088">I'm so sorry this has happened to your sister, and you, I can tell that you love her very much. I think it's great that you are being there for her, and staying by her side through all this, she really needs that support. And you're such a sweet sister to offer that to her. Getting a Lawyer that isn't emotionally involved like January said is a great idea. That way he can think objectively about the entire situation, without any personal feelings getting in the way.
It's true that you can't really trust anyone 100%, not even yourself, because in a time in your life when things get really tough, you'ld be surprized at what people are capable of,out of desperation, or grief, or even just doing anything they can to get their needs met!
But what happened to your sister was uncalled for, and was unfair to her and you're family, it was just plain cruel. And I'm just so sorry that this Man did this to your sister, and put her in this situation, after all she had done for him, being faithful to him, and giving her trust to him like that! I can see why you are so upset, I would be to, if it was me in the same situation, and if I cared about my sister!(mine's not married though) But you know what I mean? </font>