1. Find out whether the deceased person who sold the land to your deceased father has legal heirs or not,
2. If you can find them and they agree, then file a rectification deed before he said registrar for rectifying the mistake committed in the said deed,
3. If you do not find any legal heir of the said deceased seller, file a declaratory suit before the civil court praying for declaration that there was an inadvertent typographical error committed while registering he said sale deed with an order upon the registrar incorporate correction in it.