Among Armstrong's living relatives are Steven McGrath, of Cape Elizabeth, Maine, formerly energy advisor to Maine's Governor, and Adam Brecht, a media executive in New York City, whose paternal great-grandfather, John Frank MacInnis, was the brother of Marion Armstrong. Edwin Howard Armstrong's niece, Jeanne Hammond, who represented the family in the Ken Burns documentary "Empire of the Air", died on May 1, 2019 in Scarborough, Maine. Ms. Hammond worked in her uncle's radio laboratory at Columbia University for several years following her graduation from Wellesley College in 1943.