Harrasment ,mental and physical torture

Respected sir / madam, My grandmother is been tortured since past 3 years .Her both sons are treating them very badly ,she is been accused every now and then . My grandmother has 5 children ,2 sons and 3 daughters .After the marriage first 2 years they were normal and living happily with her .After that they started to accuse her started to fight intentionally and harrase her.The reason they did is because she only called her divorced daughter means her sons sister to stay at home . She was even forcefully stopped to visit her other daughter house ,she even didn't had any freedom to live happily. My grandmother used to tell these all matter to her daughter and their husbands and they looked into such matter and tried to make understand that they are wrong and tried to solve the problem but they also harassed and accused them too.And they were too helpless. Later on they started to fight with her for properties. Her two sons wife also started to tortuer her mentally and creating intentionally fights with her. Hope you understand this problem and request you to give suggestion regarding this matter Thank you.