My father have two daughters and one son(myself). Last year my father was expired. Both of my sisters got married. My mother is with me. I need to sell some of your properties(2houses and land) which is registered on my fathers name. My father has writen and unregistered will (written on Rs50 stam paper) by making me as the owner of all properties. My mother and one sister signed as witnesses.Is there any issues in selling that properties with out any involvement of my family members?