Elderly abuse

There are five sisters and two brothers. Mother was having inclination towards four younger sisters and one younger son and residing with them for about last twenty years. Father expired about twenty years ago who was a state government servant and mother is getting family pension and also having agriculture income. Now she is blind, bad ridden and unable to attend natural calls herself. Above mentioned son and daughters are withdrawing her pension and consuming all agriculture income for their benefits. Mother was not maintaining any relationship with elder son since last twenty years. Recently, their was marriage of son of elder son at parental house where no body is residing. All the sisters and brother attended the marriage along with the mother. After the marriage the above mentioned sisters and brother left the blind, ill and bed ridden mother alone at parental house where no one is residing. Villagers are presently taking care sympathetically which is very temporary and not a long lasting measure. Under above mentioned circutances what action can be taken for immediate relief against the above mentioned daughters and son who were enjoying family pension and agriculture income for their own benefits for last twenty years.