When the matter is in court and you have engaged an advocate, no one can guide you more than him as he is aware of all documented facts. The occupation of the purchaser rarely counts. The case is of specific performance and whether there were violations and if by whom and validity of such agreement to sell. All others are not relevant to this issue.
The seller's duty and obligation are confined to receiving contractual purchase consideration from the purchaser. Whether seller sells it for higher amount or donates land is not the concern of seller. Explain your point of view to your advocate and your advocate can mention any relevant issue he likes during the argument.
When the matter is in court, and your advocate is preparing his argument there is no use in discussing these things at this point of time. Because a purchaser is not having the amount in Bank that does not mean she is not having a source. Many can mobilize by borrowing at that point of sale. A seller is not concerned with the source of money of purchaser. All this should have been done before entering into an agreement of sale. When once the agreement of sale is entered it is deemed that the seller is convinced that purchaser is having enough money and can pay at that time of regular sale. Court hears both the parties. Even the court may think that because the seller is getting a high price, he is avoiding an earlier sale. Whether the property was sold after issuing notices to the purchaser was not informed by you.
Ultimately what happened ? Whether daughters retained that gift or sold away? All this is a family affair. The allegation of the purchaser may be that in anticipation of higher price, the seller is making this drama.