Horrible Home Situations-Prayers Needed

I am just hopping on to ask, no beg, for prayers.  I have mentioned my sister JC and her family before.  They are all the stereotypes you can come up and the poster people for bad decisions.  Enough said.  Yesterday there was an abuse situation at their house, the husband was choking my sister (JC).  She called in her 17 year old daughter to help, who is living with my mom.  My dad, who isn't known for good decision making (literally, he has dx mental health conditions-yes, multiple) took her over there not realizing the situation (but still evidence of his bad decision making) and he got into it with the husband, of course, because who can stand their daughter going through that (even if she does make horrid bad decisions, like marrying a drug addict...no one deserves that).  Well my dad got his head bashed against the wall by husband and was physically hurt.  To add insult to injury, my sister told him if she were the husband she would have hurt him too for things he said (the truth hurts-that was all my dad was saying).  The 6 and 8 year old witnessed everything from the choking to their dad hurting their grandpa.  Hence even more trauma and chances that they are not going to get through this okay.  The husband says he is leaving for another state.  If we would be so lucky!  I am sure it is a bluff.  I think my sister wants him to go, but on her own terms (when she is better able to take care of the kids) in a few years.  No one is filing charges as they should be.  The kids are staying with my other older sister (JB).  If husband leaves, sister has no car and not enough income to keep their home.  She already tried living with my parents and that was a disaster so that will not be an option again.  And sister likely lost her job because husband wouldn't take her to work yesterday and she was already on probation with the job.  Husband has all sorts of control over her these ways-isolated her from her family (my sister took her husbands side over my mom's and isn't speaking to her), no car, and recently he didn't pay their cell bills so there is no way to even contact her.  Most of us don't even know where they are living.  Did I mention it is a bad situation?  Maybe husband will be picked up-I mean he just got in a wreck the other day and he is driving without insurance or a license, it is all bound to catch up with him. I know there is government help, she could do section 8 housing again probably.  I know God will provide unless it is time for her to hit bottom.  I don't want the kids to suffer from their parents' mistakes.  Obviously this situation needs prayers thrown at it like crazy.  As much as I am frustrated by my sister daily, she is my sister.  I love her, but not her choices.  I don't want to see her suffer, but if it results in her making changes, it will be worth it.  Again, just asking for your prayers.  The sad thing is, this should bother me more than it does.  It should keep me awake at night.  It should derail my dissertation.  But its not.  I really think I may be coming immune to these types of things.  Sadly.  This is the crazy world I grew up in.  But I survived, no thrived.  And maybe her kids will too?  In my house it was 50/50 on who came out ahead.  Did I mention my sister (JB, obviously not JC) and mom are both social workers?  My sister's field is actually domestic abuse.  Sigh. 
P.S. I can feel your prayers.  Dissertation is going well.  My birthday was a thousand times better than Mother's Day.  Husband is being a rockstar helping out.