This is not a simple issue, and the facts on mutation records are very important. Possession, enjoyment etc., are very important and the date when the property was mutated in your father's name, documents submitted by him, etc are to be looked into. Contact a local advocate, provide him the entire records, and issue a legal notice to your father seeking partition, or a proportionate amount of sale proceeds to the extent of your share. Without verification of records, no prudent person can give precise guidance through the online portal. Being a Bank manager, he will not overlook legality and might have sold in a proper way and this is the reason for an emphasis on the keen study of the facts with documents.