Transfer of property

Ji, you, your brother, your late brother's wife ( with children if any) and your father have equal rights over your mother's 1/2 share.

Consult a local advocate, if the property is self acquired by your father and kept in joint names for convenience, he may either gift or write a will to any one after enjoying the property during his life time.  Get the property mutated in Corporation records first.  Without knowing facts and studying the document (Sale deed in your father and mother's name) , it is not possible to give the correct guidance.  (The presumption is that the property is not ancestral as it was named in parent's name who may be having their own income)

The posting suggests deeper issues. Please post the complete facts.

If the property is self acquiered,  then  from such joint property your father can make a will for his share in any of or all of the children ; Reagrding your Mother's share ,if there is no will deed from yher or any other leaglly valid document regarding transfer of her share then her share shall be distributed eaqaully among her husband,snons  and  widowed daugher in law.

Your mother's property share will go to three sons. In case of death his share will go to his wife and children. In this case your father cannot be full owner of property if your late brother's wife disagree.