See first get the property mutated in your names by making an application before municipal authorities along with death certificate of your father , an affidavit and family rasan card and other documents . Once it is mutated in your names your mother and brother can relinquish there right in your favour vide a relinquishment deed which is required to be registered and stamp duty is to be paid.
Then after there NOC and relinquishment deed file for mutation of the property in our name once property is mutated solely in your name in the Municipal / revenue Records you can sale the property.
alternatively in my opinion if the your motive is to sale the property only with minimal cost then get property mutated name of your mother brother and yours and taken a power of attorney from mother and brother to sale the property. by this POA you will easily sale and register the property this way you save the stamp duty and time on the relinquishment deed, further in this if your NRI brother is also not available in India he can make POA from foreign country and can send.