Before Sellers' death in 1804, he devised his estates to his sons, Nathan, David, John, and George.

John Jr., after learning the trade of a miller with Thomas Steel, took charge of the new mill.

As late as 1830, Augustus C. Jones was operating the old mill in grinding logwood, spices, etc.

The new mill, built in 1814, was placed under the charge of John Sellers, Jr., and was fitted with all the improved machinery of that time.

Although initially successful, the rapid expansion led to the mill's economic difficulties.

Millbourne exists today as a borough in Delaware County, between Upper Darby Township and the city of Philadelphia.