Lost cause?

So my family is divided right now. I probably shouldn't even be writing about this, but I need to vent somewhere and I'm pretty sure no one I know will see this so whatever.... The Devil is doing his worst at this moment and he's sure good at it, but we won't be defeated. Anyway, we pretty much aren't speaking to my sister and brother-in-law and this time it may be for a long period of time (or maybe until she gives birth... we'll see). We love them and want the best for them, but we are TIRED of their self-inflicted drama and the way it constantly spills over into our lives. There is only so much you can take. My sister and brother-in-law have one of the most toxic relationships I've ever seen. They are like bleach and ammonia. You don't mix them without creating poison. I'm sorry to even admit this, but I have literally told people that they are a match made in Hell. If they are not at each other' s throats (to the point of physical abuse at times) they are banding together against someone else with a taste for blood. They feed off each other's negativity. They enable each other. They blame EVERYONE but themselves... A couple of days ago was the last straw. Some drama went down with my niece witnessing everything, and my brother-in-law called us and dragged us into it. I had already warned my sister that if something else abusive happened that I was going to let his family know about it and in the heat of their fight she told me to go ahead and "put him on blast," meaning tell his family. His family has been living in la-la land for their ENTIRE relationship, never knowing about any of the crap they have put us and themselves through. We have had enough with having to deal with this alone and being completely disrespected as a family. It was their turn. So put both of them "on blast" (since they are BOTH at fault here) and we let his family know what was happening--so they would be aware and also so that his parents could go get the baby out of harms way. What happened? They didn't want to get involved and basically accused us of meddling. (Side note: I won't get into what was said, but they are officially on our bad sides as well. Maybe if they LISTENED to what we were telling them, they would have heard that WE are the ones getting DRAGGED into messes we want nothing to do with--aside from wanting to protect the child and the child that is about to arrive.) Then my sister and her brother-in-law informed us that they were going to get help the following day. We were forced to tell them that his parents are aware of the situation at that point. That's when my other sister gets this message: "Thanks for f***ing up my life." Um........................ Wow. So WE are screwing up YOUR life? No you? Not your husband? Us. The people you have dragged into this for the last 10 years. We are doing it. HAHAHAHAHAHAHAHA!!!!!!!!!!!!!!!!! And that was our breaking point. I love my sister. Truly I do, but I'm not surprised that everything is everyone else's fault and that she is the victim here. She's always been this way. Ever since we were little, but now she has married another victim for reinforcement. Yeah. You're the victims. The victims of yourself. So, we're to the point where we are ready to step to the side so that they have no one to blame but themselves when these problems persist even when we are not in the picture. I PRAY that the Lord does something with them already. There is no where else to turn. Only HE can fix this. Only HE can break them down to nothing. For now, we are going to protect ourselves from the toxic fumes of their relationship and hopefully they will see when they don't have us to pick up the pieces just how much it is NOT our fault. God, in the meantime, please protect my niece and the nephew that will be here soon. They don't deserve this...