Roosevelt's home in Hyde Park is now a National Historic Site and home to his Presidential library. Another son, also named Franklin, was born in 1914, and the youngest child, John, was born in 1916.Roosevelt had various extra-marital affairs, including one with Eleanor's social secretary Lucy Mercer, which began soon after she was hired in early 1914. In September 1918, Eleanor found letters revealing the affair in Roosevelt's luggage. Franklin contemplated divorcing Eleanor, but Sara objected strongly and Lucy would not agree to marry a divorced man with five children. The largest, the 7 1⁄2-acre (3-hectare) Roosevelt Memorial, is located next to the Jefferson Memorial on the Tidal Basin. A more modest memorial, a block of marble in front of the National Archives building suggested by Roosevelt himself, was erected in 1965. Roosevelt's leadership in the March of Dimes is one reason he is commemorated on the American dime.