transfer of property in bangalore

My father died intestate leaving behind a house in bangalore, built by him on land purchas. We are three brothers and a sister. he house's khata was transferred in my mother's name and she executed a will that it will be divided equally between the sons and the daughter. She is no more now. Now I want to sell my share to one of my brothers. For this are my son's required to sign as witnesses for the transfer deed? As per my understanding, their right in the property starts only after my demise.