Reginald Claypoole Vanderbilt American equestrian (1880–1925) (1880–1925) Parents Alice Claypoole Gwynne Cornelius Vanderbilt II Children Cathleen Vanderbilt Gloria Vanderbilt Siblings Gertrude Vanderbilt Whitney Gladys Vanderbilt Széchenyi Alfred Gwynne Vanderbilt I Cornelius Vanderbilt III William Henry Vanderbilt II Alice Gwynne Vanderbilt Partners Cathleen Neilson Gloria Morgan Vanderbilt
