The following information about the Hornbys of Poulton in the 17th century is supplied by John Porter in his History of the Fylde, unfortunately he provides no references:
The Hornbys, of Poulton, were descended from Hugh Hornby, of Singleton, who died about 1638,. after having so far impoverished himself during the civil wars as to be obliged to dispose of his estate at Bankfield, inherited from his sister, and purchased from him by the Harrisons. Geoffrey Hornby, the son of this gentleman, practised very successfully as a solicitor in Preston, and probably was the first to acquire property in Poulton. Edmund Hornby, his eldest son, of Poulton, where he also practised as a solicitor, and Scale Hall, married Dorothy, the daughter of Geoffrey Rishton, of Antley, in Lancashire, Member of Parliament for Preston, and had issue Geoffrey, George, and Anne. 
Dorothy, the daughter of the Geoffrey Rishton mentioned, would have been the sister of Ralph Rishton, the Preston postmaster.