1. It is your right to see your deceased father's WILL and you are entitled to a copy of the same and your mother & elder brother cannot refuse a copy of the WILL.
2. In case they refuse to give you a copy of the WILL, you can serve them a legal notice and exercise your right.
3. In the alternative, if the WILL is a registered one(registration of WILL is optional), then you can get the certified copy of the WILL from the Sub-Registrar's Office, where the WILL was registered.
4. The deceased person's property would devolve to the beneficiaries, as stated in the WILL.