Is daughter In -Law has any right on her mother-in-law's property

Sir, my sister is residing with his husband. He is continuously torture her mentally and physically. He has his flat which he registered to her mother's name so she couldn't be able to ask any financial help form him. Beside this he is not working properly therefor never give any money to my sister ever for house expense. Every time when she asked for money he denied and said i am giving you all the thing then what is the need of money to you. Now she is working because of financial problem. But he wanted her salary too. She has two daughters. and paying all the expense of her elder daughter(her school fee and day to day expense). Since when she denied to give him salary he continuously telling her to leave the job and sit at home. He is blaming her that she is characterless and spy her daily he checking her mobile daily and chase her upto office daily and called her many times in office and disturbed her. Even when she goes to washroom. He dialed land line office number and asked for her from the official. This is the very embarrass condition for her. She is going through very tough mentally condition now a days.When we tell him to separate her he told i will not give a penny to her because i have no work and house is on my mother's name. I have nothing to give. I want to know what is the laws to protect her rights and what can she do to come out of this situation. Can she have any right on his mother- in- law's house.