Among his siblings was Raphael, Jacobus, Frans, Maria, John, and Catharine Goelet (wife of Peter Theobaldus Curtenius).
[5] Goelet was at first in partnership as a hardware merchant with his brother-in-law, Peter Theobaldus Curtenius, but from 1763 his place of business was Hanover Square, at the sign of the Golden Key.
After their partnership dissolved, he moved his business to his residence at 113-115 Pearl Street, where he sold musical instruments, brushes, hardware, and cutlery.
[6] He used his profits from his merchant business, and the Revolutionary War, to buy real estate in Manhattan, later acquiring a wharf and yard on Exchange Slip, and establishing the Goelet family fortune.
[7][8] In 1799, Goelet wrote to Alexander Hamilton regarding Gen. Philip Schuyler's purchase of lands from Robert Morris as a trustee of the American Iron Company.
[2] Peter and for a time, his sister Hannah lived in a mansion on the northeast corner of Broadway and 19th Street, which grounds were known for peacocks, storks, and other exotic birds.