In 1840, there is a John Bradt in Amsterdam, living with 3 females under 5 and one under 30.

In 1850, John Bradt was living in Amsterdam, Montgomery County, NY. He was 41, a millwright. He held real estate worth $400. With him were wife Catherine, age 36; daughter Charlotte, age 14 (?); Margaret, age 12; Mary, age 9; John, age 7; possibly Nicholas, age 6, and Peter, age 1. All were born in New York.

In 1860, John Bradt was living in Amsterdam, Montgomery County, NY. He was 50, a farmer, property valued at $2500. He gave his place as Waterford; the place of birth for his wife and children was Amsterdam. With him were wife Catharine, 45; daughter Margaret, milliner, 21; Mary, 18, dress maker; John H., 17, farmer; Nicholas, 15; Marcus, 9; Chester, 7; Eliza, 2; Hariet, 1.23

In 1880, John H. Bradt was living in Amsterdam, Montgomery County, NY. He was 69, a farmer, and he and his parents were from New York. Wife Catharine was 65, she and her parents were also from New York. With them were daughters Eliza J., age 22, “at home,” and Hattie, age 20, dress maker.24 With them was Jane Harris, 77, “boarder.” Possible she was a sister of Catharine.