Get the property on sons name -

Hi, a) plot acquired by father, expired 2018 intestate. House constructed, original plan was 2 floors - 1 floor built , plan approved by father. === son constructed the house to help sisters get married, paid marriage costs etc,etc for the past 20 years,,helped sisters with down payment for sisters to buy other properties and settle,helped nephews with financial costs for higher education etc.,helped with all capital costs for events, health, surgeries etc,helped with fathers health care costs utill he left us. === Eldest sister's family lives in the house now to take care of mother. Second sister now wants to build a floor on the building. all 3 sisters are married ==== My goal is to 1) keep the house so its passed down to children and prevent family members to sell it and keep it as a ancesteral property - wish of my father. Is this too good to expect - just sell it and make peace ? 2) Always thought this is my place in so did not invest other properties - Loss of opportunity Applied for Inheritance certificate - due to covid waiting.