The Bradt family originated in Norway and went to Holland before coming to the New World in the 1630's. The Loyalist Bradt family lived in the Mohawk Valley in New York. They had a large estate and were considered fairly well-off. After the Revolutionary war broke out, they joined John Butler's Corps of Rangers. They sacrificed everything they owned when they sided with the British. Several of the Bradt men were ranking officers in the Butler's Rangers. Catherine Bradt Butler, who was taken captive by the rebels, along with her children was Col. John Butler's wife.The Bradt families settled in the Niagara region after the war and resumed farming.
There is quite a bit of information about the Bradt family in New Amsterdam on the Olive Tree Genealogy website, hosted by Lorine McGinnis Schultze.