History is the twelfth studio album by which American singer-songwriter, who was the father of folk singer Loudon Wainwright III, and singer Sloan Wainwright?
History (Loudon Wainwright III album):  The album was recorded following the death of Wainwright's father, Loudon Wainwright Jr.. Loudon Wainwright Jr.: Loudon Snowden Wainwright Jr. (December 16, 1924 – December 12, 1988) was an American writer.
Loudon Snowden Wainwright Jr.