I am working on my family history as well and noticed your posting. On a site that is no longer available I located the following info. Not certain of accuracy but perhaps it might correspond with what you may already have?
Abraham or Abram Adam (b) Jan 16, 1790 in Halifax County, VA. Married to Nancy Hancock (b) Apr 19, 1790. She was the daughter of Alfred Hancock.
William (1811-?) Peter (1813-?) Jacob (5/13/1815 - ?) Hannah Leann (1815-1878) who was my paternal ggg-grandmother Mary W. (1819-?) Susan Jane (1821-?) Sarah (1823-?) Wells W. (1835-?)
Like you I have been told that we are related to the President's family and even through Nancy Hancock's family to a signer of the Declaration of Independence but who really knows?
Please feel free to drop me a line if you have any additional info to share.