Grandmother maintainence

Responsibility for taking care of ageing mother she is almost 98yrs My father died 2yrs ago. I am leff with grandmother ,my husband (he is handling my responsibily which i promised my father )and 11months daughter .Due to pandemic my hubby had major loss in business and now he not getting job he is doing daily basis income which is 300rs maximum. Grandmother is bedridden after surgery which is after 30days of my delivery who is quite old and requires assistance for everything.Due to health issues we have keat her at oldage cz of her illness which can spread to my daughter ..i dont have seperate room in house where i can keep her to avoid infection . My father has younger brother elder sister and yonger sister. My father has already transferred property on mine n sisters name ..which is just a nomination in our society Grandmother gets pension of 7k which is not sufficient to survive alone or at oldage home .and of i keep caretaker at home charges 19k excluding medcs diapers etc and oldage home charges 12k including medcs. I am not in position to pay house maintainnces billis mecdcs .i have left my inlaws house juct to tc of grandmother Who is responsible for taking care of my grandmother as per law?