Brother purchase property money paid by father

Get the settlement deed from your father. without registerd settlement transaction not valid.

It is possible get the witness signature from your brother. Otherwise wise that notary.

Raju Desai,

You must get a registered release deed from your brother which clearly mentions that he is giving up all his rights on the ancestral property . ( Any unregistered settlement / release deed carries no value in a court of law).It would be better if you mention the amount being paid by your father and the descripttion of the property which your father is buying on behalf of your brother ( This will help you in case of future litigation). You must then make a registered agreement  deed/partitoin  between your father and yourself  with clear details as to how the property will be partitioned.