Father in law is tortured by daughter in law

My father is very old man even he can't see..my mother in law got expired before 11 years..due to domestic violence and also she was a heart patient...I m younger daughter in law...my(jethani) Sister in law is belongs to lower middle class family...my in laws family is very nice & peace...after MIL death...she used to torture my FIL ..not given food also..my husband(his younger son) brought the readymade food from outside..after my marriage..I can't even see this all..my husband decided to live separate on the 1st floor even my FIL also lives with me...but she always used to abuse us...give the warnings to kill my FIL and son also....after sometimes..we decided to go from there..but we need financial support..my FIL decided to sell the property..but they don't let us do this..she want us to go with nothing..last night.she throw my FIL out of house..also give a threathen of dowry case...my FIL is very simple &decent guy..due to social reputation he even not raise a voice...I am afraid...but happen next..but I can and can't let them to live these horrible environment..please help us .please