My DB and SIL have years of unhealthy relationship behind them. Yesterday, yet again it came to a head, with flying objects, shouting, screaming, physical and verbal abuse :( Two children, aged 10 and 2, are in utter shock, although not for the first time. Parents are in shock too, but unable to act on it in a constructive way.
Generally, DB flatly refuses to separate or divorce. He's happy 
SIL wants out, but is financially dependent, and although unhappy, doesn't have the strength to act on it. She tried but keeps buying his promises that things will improve. I support her the best way I can but it is difficult because she is not actually doing anything to change the situation.
I talked to her yesterday. Gave her all the usual advise - relationship counseling, making steps towards financial independence. She also knows she and the kids can come and stay at ours any time.
I will talk to DB later today. What do I say? How do I shake him up into dealing with it? Help me to put this into words. This is so far beyond normality, and has such a long history, that I am lost for words.
Thank you...