Don't Know What to Do..

     Ok so here is what's happening... My sister & brother-in-law have been married about 14ish years. Apparently their marriage has been ALOT harder on her than we ever knew. She doesn't open up a lot so we had no idea she was feeling like this for SO long... But pretty much my brother in law has always cared ALOT about image, has always had a BAD temper ...etc. My sister couldn't be more different. They got married too young and my sister wanted to call it off, but where we grew up there was a lot of pressure to be married right out of high school...So she never called it off even when she was doubting the relationship. So fast forward to recently, my brother in law moved out because they were having more issues but moved back in after a few months & is now threatening to take the kids if she wants to divorce. He is mislead their two kids to think it is all her fault and she called my moms house in tears about what he is doing. 

     I live on the other side of the country and it's killing me that she is going through this & that I can't be there for her & that there is nothing I can do. I really want to just fly home & take her & the kids away from everything. And I'm REALLY angry with my brother in law...I HATE that he is doing this to her...