1. Your query is answered considering that you or your father has taken adequate care in conducting the title search for the said property and the property is O.K.,
2. However, if it is found later on that the sale of the land has been conducted without being approved by the appropriate authorities, you can file a recovery suit claiming back the money you have paid with interest, damage caused to you and also cost for filing and persuing the suit,
3. If there is any construction on the plot, then you can file a complaint case before your local district consumer dispute redressal forum.