Sources conflict on the sire of Rattle; he may have been by a son of Harpur's Barb rather than Harpur's Barb himself. He got the dam of Silvertail (ro f 1737 Heneage's Whitenose) who won two Fifties, at Nottingham and Leicester, before entering the stud. She produced Whimsey, by the Cullen Arabian in 1747 and was then put back in training and won six more more Fifties, at York, Lichfield (two), Chipping-Norton, Derby and Maidenhead. She broke down while winning the first heat of a Fifty at Nottingham. A superior matron she produced among others Warren's Careless (ch c 1751 Regulus) and Fearnought* (b c 1755 Regulus). Most of Family 32 descends from Silvertail.