Elliott Roosevelt ’ s father was crippled by a paralytic illness in 1921 .
With James Brough , Roosevelt wrote a highly personal book about his parents called The Roosevelts of Hyde Park : An Untold Story , in which he revealed details about the sexual lives of his parents , including his father 's relationships with mistress Lucy Mercer and secretary Marguerite ( `` Missy '' ) LeHand as well as graphic details surrounding the illness that crippled his father .
Elliott Roosevelt