#1 is James Boswell, the biographer of Johnson, who lived 1740-1795.
#2 is his son, James Boswell the Younger, who lived 1778-1822 and was also a lawyer -- he is the author of the memoir of Edmond Malone.
#3 Boswell, James 1906-1971, English artist - James Edward Buchanan Boswell (9 June 1906 – 15 April 1971)
#4 James Boswell illustrated The Drowned World (I think this is the great grandson of #3)
