Father's savings after his demise

Demand from your  brother, your half share in said money of your father failing which you can file recovery suit against your brother in court. 

It's more than three years since my father's death. Can I still file?

If your father died intestate, you have an equal share of the amount.  Send him a legal notice; if he does not respond, file a suit.

You serve a legal demand notice demanding payment or settlement of your share in that money.

If he acknowledges that then your limitation to file a suit for recovery of money will start fresh.

How much money was there in the Bank account of your deceased father ?

I don't know. 

You do not know how much money your father had in his account. You do not know whether your father had filed a nomination. You do not know whether your father had left a will. Your brother was taking care of him. You were not even visiting your father when he was alive. If your brother has taken all the money, it would have been possible only if your father had an either or survivor or a former or survivor account along with your brother or your father had nominated your brother for the account. Though there are judgments ruling that a nominee alone does not have  exclusive beneficial rights over intestate property, most people believe that holding the money in survivor account or nomination gives the successor exclusive right. Your father also would have thought so.  The judgments otherwise are a pulling of carpet from under the feet.

For the above reasons and since now it is more than 3 years after your father died, abandon the claim. You have no moral right for the claim.