format of sales did

First you have to get the property in your name then you can sell it, merely on the basis of will you cannot sell it unless your sister too agrees with your mother. (for that you have to get the probate from court).

You say you have the property card in your name. Is it issued from the city survey department if yes then how is it possible that the card is in your name and the house was owned by your father. Generally the house is in the name of the person in whose name property card stands.

If the property card refers to the land on which the house is built then you will can sell the land with house in such situation your sister would not be able to do much.