Father selling some of his property to one of his sons

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Check below answers in case you are looking for other related questions:
Selling a product at different prices to different customers
Selling at more than 10% profit

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Related Answers:
Ruling on selling water
He bought an apartment on the basis that it would be a certain area (square footage), and it was built larger. Does he have to pay the difference?
He accepted a gift coupon – can he sell it for less than its value?
Selling a product at different prices to different customers
Selling at more than 10% profit

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