Final answer:
William Penn generated revenue through the sale of land and the collection of rent in the rapidly developing Pennsylvania colony, which he established with the help of a debt inherited from the crown.
Step-by-step explanation:
William Penn's children were not the primary focus of his financial endeavors, but rather it was William Penn himself who made money through his efforts in establishing the Pennsylvania colony.
After inheriting a considerable debt from the English crown upon his father's death, Penn used this as leverage to obtain the charter for the land that would become Pennsylvania.
To ensure the rapid development of the colony, William Penn sold plots of land to fellow Quakers and supported the development of the port city of Philadelphia to attract industrious merchants. In this way, Penn generated revenue from land sales and rent which helped to spread his financial burden and attract settlers to Pennsylvania, promising them equal rights and financial opportunities.
The growth in population and the influx of settlers meant the colony thrived economically, which in turn increased the value of the land and the wealth of its proprietors.