Granville Penn was a great-grandson of Admiral Sir William Penn, a British author, and scriptural geologist.

Thomas Penn was an English landowner and mercer who was the chief proprietor of Pennsylvania from 1746 to 1775. He was one of 17 children of William Penn, the founder of the colonial-era Province of Pennsylvania in British America. In 1737, Thomas Penn negotiated the Walking Purchase, a contested land cession treaty he negotiated with Lenape chief Lappawinsoe that transferred control over 1,200,000 acres (4,860 km2) of territory in the present-day Lehigh Valley and Northeastern Pennsylvania regions of Pennsylvania and a portion of West Jersey in colonial New Jersey from the Lenape tribe to the Province of Pennsylvania.