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How was landscape painter Gaspard Dughet related to Nicolas Poussin?

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The landscape painter Gaspard Dughet was the brother-in-law of Nicolas Poussin.12

The relationship began when Poussin fell ill around 1630 and was nursed back to health by the family of Jacques Dughet. Poussin subsequently married Jacques Dughet's daughter, Anne-Marie, making Gaspard Dughet his brother-in-law. Gaspard, who also studied under Poussin, held his brother-in-law in such high regard that he adopted the surname Poussin for himself.21