1. It is true that the owner of the property has to have Khata in his name to enable him to sell the property.
2. At the time of registration of the property in favour of the purchaser, the seller has to provide Khata of the property in his name to enable registration of the property in the name of the purchaser.
3. To answer whether the purchaser is likely to confront any legal problems in future or not in case he buys your property and to provide legal opinion on the property, one has to go through the documents and arrive at correct opinion