You were an equal stakeholder in your father's property. Unless your father had during his life time legally authorised your elder brother to sell his property after his life time your brother could not have sold it in a manner the effect of which was to deprive you of your equal share therein. Be that as it may, you may now file a case against him to recover from him the sale proceeds of the property which he sold to your exclusion.

In addition to what my learned colleague has advised, you may also file a case in a competent court for declaration of the sale deed as null and void.