What are my rights if father falsely claims my property?

Based on the facts provided, you are the sole legal owner of the property in Bangalore, having purchased the land in your name using your own funds and a housing loan, with construction later funded through an additional loan; the ₹3 lakhs sent by your father in 2002, which was inadvertently used to repay part of the loan, does not establish any legal claim over the property, especially since it was neither documented as an investment nor a condition-based contribution, and your nephew’s stay at your residence for studies further supports that it was a personal arrangement rather than a financial partnership—therefore, your father’s current claim in 2023 that the property is family-owned lacks legal standing, and you may contest any such assertion through a civil court, asserting your absolute ownership supported by property documents, bank records, and loan agreements.