 His son, Tom Kneitel, an avid amateur radio operator (License K2AES), was the founding editor of "Popular Communications" magazine, and he died on August 22, 2008 at the age of 75.His daughter, Virginia, headed a design and exhibition office for the Smithsonian Institution.Seymour's youngest son, Kenneth, a major collector of vintage material, established and ran the store 'Fandango,' in New York City.