Question: Who was born September 5, 1946 and was the father of the American singer-songwriter Lucy Wainwright Roche?

Context paragraphs:
Loudon Wainwright Jr.: Loudon Snowden Wainwright Jr. (December 16, 1924 – December 12, 1988) was an American writer.  He was the father of folk singer Loudon Wainwright III and singer Sloan Wainwright, and grandfather to Rufus Wainwright, Martha Wainwright, and Lucy Wainwright Roche.

Lucy Wainwright Roche: Lucy Wainwright Roche (born December 16, 1981) is an American singer-songwriter, and the daughter of musicians Loudon Wainwright III and Suzzy Roche.  Preceded by two EPs, "8 Songs" and "8 More", Roche released her debut album, "Lucy" in October 2010.  She also stars as Jeri in the "Stuff You Should Know" television show.

Lucy (Lucy Wainwright Roche album): Lucy is the debut studio album by American folk musician Lucy Wainwright Roche, released on October 26, 2010 on Strike Back Records.  Produced by Stewart Lerman, the album features appearances from Roche's father Loudon Wainwright III, The Roches, Steuart Smith, David Mansfield and Kelly Hogan.

Stewart Lerman: Stewart Lerman is a Bronx born, New York-based, 2x Grammy winning music producer, recording engineer, who has worked with The Roches, Elvis Costello, Neko Case, Patti Smith, Antony and the Johnsons, Angelique Kidjo, Shawn Colvin, Julian Casablancas, Jules Shear, Marshall Crenshaw, Crash Test Dummies, Sharon Van Etten, Nellie McKay, Loudon Wainwright III, Black 47, David Johansen, David Byrne, Willie Nile, Charlie XCX, Soulive, Darden Smith, Sophie B. Hawkins, Sufjan Stevens, St. Vincent, Regina Spektor, The Accidentals, Lucy Wainwright Roche, Vince Giordano, Liza Minnelli, Dar Williams, Carl Hancock Rux and 58 episodes of Boardwalk Empire, 10 episodes of HBO's Viny.

The Best of Rufus Wainwright: The Best of Rufus Wainwright is an ongoing concert tour by American-Canadian singer-songwriter Rufus Wainwright in support of his greatest hits album, "" (2014).  The tour was announced on Wainwright's official website in December 2013, initially for 23 performances in more than 20 countries throughout Europe during March–April 2014.  Subsequent dates were added in France, the United States and the United Kingdom, extending the number of concerts to 31.  Wainwright's half-sister, Lucy Wainwright Roche, has been confirmed as the opening act for select dates.

The Wainwright Sisters: The Wainwright Sisters are a singer-songwriter duo featuring the Canadian-American Martha Wainwright and her American half-sister Lucy Wainwright Roche.  In November 2015 they released the album "Songs in the Dark", which includes a number of lullabies.

There's a Last Time for Everything: There's a Last Time for Everything is the second full-length studio album by singer-songwriter Lucy Wainwright Roche.  The album was recorded over ten days in Nashville in collaboration with producer Jordan Brooke Hamlin.  Of the quick recording, Lucy said, "Jordan and I crafted these tracks over long summer days that stretched into late, late nights.  We were gloriously swept up in the process, like kids working on a secret project.  Because we were working with a limited time frame, we went with our gut on every decision.  There wasn't time for us to second guess or retrace our steps.  The urgency of working that way was exciting and freeing - and also a little bit terrifying.”  The album was released on October 15, 2013.

Dom Kelly: Dom Kelly is the drummer/vocalist and a founding member of Charleston, SC-based rock band A Fragile Tomorrow.  In 2017, he will be releasing his debut solo album on MPress Records.  The album features appearances from Emily Saliers of Indigo Girls, Lucy Wainwright Roche, Chris Trapper of The Push Stars, Sarah Bettens of K's Choice, Doris Muramatsu of Girlyman, and his identical brother and A Fragile Tomorrow bandmate Sean Kelly.

Loudon Wainwright III: Loudon Snowden Wainwright III (born September 5, 1946) is an American songwriter, folk singer, humorist, and actor.  He is the father of musicians Rufus Wainwright, Martha Wainwright, and Lucy Wainwright Roche; brother of Sloan Wainwright; and former husband of the late folksinger Kate McGarrigle.  He resides in Canada.

Songs in the Dark (album): Songs in the Dark is the debut album by the Wainwright Sisters, a singer-songwriter duo featuring the Canadian-American Martha Wainwright and her American half-sister Lucy Wainwright Roche.  The album, released on November 13, 2015, includes lullabies that their mothers Kate McGarrigle and Suzzy Roche sang to them as children, plus songs by Woody Guthrie, Jimmie Rogers, and their father Loudon Wainwright III.

Supporting paragraphs: Lucy Wainwright Roche Loudon Wainwright III
Answer: Loudon Snowden Wainwright III