I'm not related, but I am doing some family history related to the Addamses.Specifically, I am researching the ancestry of Charles Addams (the cartoonist of "Addams Family" fame), for a bbiography my wife (Linda H. Davis) is currently working on, to be published by Random House.
He is six generations down from the William Addams and Anna Lane on your list: their son Isaac (1747-1809) who married Barbara Ruth (1743-1832) had a son Samuel (1782-1854) who married Catharine Huy (1787-1866) who had a son Charles H. whose dates and wife I have not located yet, who had a son Samuel H. (1842-193?) who married Kate A. Reinhold (1840-1908), who had a son Charles Huey (1873-1932) who married Grace M. Spear (1879-1943), whose son was Charles Samuel Addams, the cartoonist.This information is not gospel, by the way -- only some of the details are positively confirmed, though the generality of it is clear enough.
You may also be interested to know that Samuel Addams and Catharine Huy were also the grandparents of Jane Addams, the famous Chicago reformer and Nobel Peace Prize winner, via their son John Huy Addams.
I don't have any info about Richard Addams, though, or generations preceding him.
Hope this is of interest to you anyway, though.You information about Richard was of interest to me!!!Thanks for posting it.