My husband's gr.gr.gr.grandfather was Samuel Abbot born in 1765 in Boston. I don't know if he had any brothers or sisters. He could have been an uncle to your Nathan. Samuel Abbot had 13 children and one was named Nathaniel, possibly after a relative. Nathaniel was born in 1794. I know that Samuel had a son that went to NY and also one that went to Conn. Sorry I don't have any more information for you.