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Michel was a son of Jean Georges Hyacinthe Marie Donnet (1888–1957) and Mariquita Jeanne Françoise Eyben (1891–1979). Jean Donnet was a refrigeration contractor who served in World War One as a volunteer with the Belgian army engineer corps. Michel Donnet married Jacqueline 'Kiki' Gautier (b. 1925). They had four daughters (Anne, Marie, Therese, Claire) and one son (Jean). He died on 31 July 2013, at Waterloo, Belgium.