Husband black mails his wife

One of my neighbourhood woman was being harassed verbally by her husband. They got married 26 years back and the person got married to the woman by mentioning that he has 5 acres of land property working as an LIC agent. But that person has nothing but debts. He took 112 gms of gold from her parents mentioning he will do and business and left her when she was pregnant and having a small kid. some how she caught him and compromised to live together. She started stitching clothes for near by women and earned money by selling sarees. Now they have grown up kids and they recently started their career by earning for livelihood. He was not doing any kind of job and started demand his children salary. They suggested him to start working by which they can get settled atleast now with own house, He came up with a plan to file a case of attempt to murder on his wife so that he can demand money to withdraw case. I suggested her to file a police complaint on her husband, but she refused keeping in mind the society status which may impact her children career. can anyone suggest how to control that bastard who is not having minimal ethics and family values.