Father died leaving behind joint account mother utilizing all money

My father had 2 joint accounts (with either or survivor clause selected) with my mother before he passed away. Now, my mother as a joint account holder is operating the account after converting it into her family pension account. We are 4 brothers. My mother wants to utilize the entire money according to her free will. She is not interested in distributing the money since all of us are well settled. Can we make any claim to the amount lying in the joint account of the bank while our mother is alive? Our father has not left any will or instruction to distribute his savings. Ours is a Hindu family.