Dear Bruce I think you are descended from a different family. I made an error in my original posting - it should have read 1774 rather than 1744. I feel sure that this John was English born but died in New York. He had a wife, Mary, two daughters Agatha and Martha, plus an Elizabeth Bradstreet who he refers to as "my wife's daughter".
I have four wills relating to this family - 2 are John's, one is his wife's and the last is his daughter Martha's.
The first will of John's is made in 1754 when he was Lieutenant-Governor of St John's Garrison, Newfoundland. In it he refers to his wife Mary and two daughters Agatha and Martha.
John's second will is made in 1774 and proved in New York on Sept 23rd. Now he describes himself as Major General in His Majesty's Army. Again he refers to his two daughters and Elizabeth Bradstreet "my wife's daughter". There is no mention of a son. He makes Charles Gould Esq of London an executor of his will.
His wife's will is made 23rd March 1782 and proved 6th April 1782 in London. Again, Charles Gould is executor, which links it conclusively to her husband's will. I believe her daughter Elizabeth married Peter Livius and the couple were living in America.
Martha's will is made & proved shortly before her mother's, in 1782. She is "formerly of Boston but now of Mary[le]bone, London". As I said in my original posting, it is in this will that she refers to her late brother Samuel and his children. This is the only mention of Samuel and this is why I wondered if he had remained in America. Clearly the family were English but had travelled and lived in America for some years and had family connections there.
Apologies for so much information, but I hope someone will be able to connect with it!