When Jan Orser was born on 23 April 1723, in Philipsburg Manor, Westchester, New York Colony, British Colonial America, his father, Aert Willemsz, was 44 and his mother, Mary Mott, was 43. He married Rachel Belyea on 13 September 1746, in Tarrytown, Westchester, New York Colony, British Colonial America. They were the parents of at least 4 sons and 2 daughters. He died in 1782, in Ossining, Ossining, Westchester, New York, United States, at the age of 59.