He brought his sons William (Elizabeth's husband) and James into the import-export mercantile firm, the William Seton Company, which became Seton, Maitland and Company in 1793.
Ia membawa para putranya, William (suami Elizabeth) dan James, terjun ke dalam perusahaan dagang ekspor-impor, William Seton Company, yang menjadi Seton, Maitland and Company pada tahun 1793.