Grey Wilkes was a successful and significant broodmare, dam of Sister to Old Country Wench - dam of a) Squirt (grandsire of Eclipse); b) dam of Lady Caroline (1744 King's Plate [mares] Hambleton, 1745 King's Plates [mares] Newmarket, The Curragh; and c) grandam of Regulus (1745 King's Plates Winchester, Salisbury, Nottingham, Canterbury, Lewes, Lincoln and Newmarket, 1746 King's Plate Newmarket, and Champion Sire 1754, 1755, 1756, 1757, 1761, 1763, 1765 and 1766); Grey Wilkes is also 3rd dam of Robinson Crusoe (1729 King's Plate York, 1730 King's Plate Newmarket);

and grandam of [Egerton] Nanny (1729 King's Plate [mares] Hambleton, 1730 King's Plate [mares] Newmarket)

Full sister to Clumsey, sire of top class racehorse Fox, Champion Sire in Great Britain in 1731 and 1735, and full sister to Old Wen Mare, dam of Alcock's Arabian, Champion Sire 1728 and sire of the exceptionally successful stallion Crab (Champion Sire 1748, 1749, 1750)