A “forgotten” painting kept in the same family for generations has sold for 7.68 million euros ($9.1 million) at auction after experts discovered it was the work of French painter Jean-Honoré Fragonard.A “forgotten” painting kept in the same family for generations has sold for 7.68 million euros ($9.1 million) at auction after experts discovered it was the work of French painter Jean-Honoré Fragonard.