Question: Who was born September 5, 1946 and was the father of the American singer-songwriter Lucy Wainwright Roche?
Sentence (from "Loudon Wainwright III"): 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.
Relevant evidence: No