After William's death in 1718, interest in the proprietorship passed to his three sons by Hannah: John Penn "the American", Thomas Penn, and Richard Penn, Sr., with John "the American" inheriting the largest share and becoming the chief proprietor. When John "the American" died without children, his brother Thomas inherited his share and became chief proprietor.
When Richard Penn, Sr. died, his share passed to his son Governor John Penn. When Thomas Penn died, his share (and the chief proprietorship) passed to his son John Penn "of Stoke". All of these changes are summarized in the following table: