Dear Rupa,
I am not lawyer, but I would say children has to listen to mother and ensure her remaining days are peaceful and fulfilling. Though law says Mother and children are equal, but I am sure if you go to court things will only get delayed or will be ruled in favor of your mother.
Assuming your father has not left a will, I should say there are numerous families in this situation, best is to go for family settlement under mother's guidance. In absence of father, mother is tallest. Unfortunately law treats Mother on par with kids resulting in disputes and indifferences among the family.
Go home and listen to your mother, ask your siblings to do the same and ensure mother is happy.
Regards,
Pradeep