Lady Mary Pierrepont (1865-1917) (1865–1917) Parents Georgiana de Franquetot Sydney Pierrepont, 3rd Earl Manvers Children Jean Grant Gregor James Grant Siblings Henry Sydney Pierrepont Emily Pierrepont Charles Pierrepont, 4th Earl Manvers Evelyn Henry Pierrepont Partners John Grant, 13th of Rothiemurchus