<human>: I need some advice regarding my sister and her kids.  I found out tonight in a phone conversation that my sister and her 4 kids are being abused by my brother in law.  I am 5,000 miles away and feel helpless.  The abuse has been going on for years apparently,  it has escalated to death threats, i.e. you tell anyone or leave and I'll kill you and the kids.  I'm sick to my stomach typing this.  She has four kids, 18, 16, 14, and 11.  The 18 year old has mentioned taking matters into his own hands and "taking care of" his dad.  My sister is depressed and fearful, she doesn't drive, barely leaves the house.  I've urged her to seek therapy for years for what I assumed was just depression, I never knew about the abuse.  My first thought is to call the police, press charges, get a TRO.  It's not that simple though, she fears he will just find her at my parents house and kill her TRO or not.  She has been a stay at home mom with no skills and no means to support her kids on hew own.  She feels trapped!  This abuse obviously is taking it toll on the kids.  

I'm thinking my best course of action is to talk to a local domestic abuse therapist or assistance organization and asking them what I can do from where I am.  Also contacting a similar organization in her area.  Is there anything else I should consider?  I've told her to try to get the abuse on video or audio for proof in court.  

Thank you for your time and any advice.

Can you summarize the given text in a few sentences?
<bot>: Found out my Brother in Law is beating my sister and their 4 kids.  I'm 5,000 miles away, besides getting on a plane and killing the bastard, what is my best course of action to help them?