Your family has been cultivating ancestral land since 1942, with names registered on the 7/12 extract. However, a nomination has been unexpectedly registered on the property in 2020 without your knowledge. It's crucial to investigate this by obtaining encumbrance certificates, verifying revenue and municipal records for any applications, and identifying the person who filed the nomination. Seek advice from a local advocate after gathering all relevant documents from the revenue and registrar offices to understand the situation and plan your remedial actions.