Question: Who is the father of the performer of I'm Stepping Out?

full_context: Document 1: Johanna von Trapp: Johanna von Trapp married Ernst Florian Winter on Easter Monday in 1948 and changed her middle name to Franziska. She had seven children: Ernst Leopold (1949–1969), Florian Stefan (1951), Johanna Maria (1952), Notburga Maria (1953), Hemma Maria (1956 ), Agathe (1957 ) and Severin (1959 ). She lived with her family – four daughters and three sons – in both the United States (West Nyack, NY) and Austria (Salzburg, Schloss Eichbuechl N.O.). With Ernst Florian, she raised her children in an organic homesteading tradition incorporating her rich European heritage into family life. She was known for her hosting, cooking and preparing feast day meals that often were shared with upwards of 50 guests. Her indomitable go-to spirit and ability to persevere through the loss of her oldest son from a car accident, showed her strength and resilience. She was known to her children as the story teller of her childhood life in the von Trapp family. Approaching life with a great sense of humor and faith, carried her throughout her life.
Document 2: Nobody Told Me: "Nobody Told Me" is a song by John Lennon. The B-side features Yoko Ono's "O' Sanity"; both are on the "Milk and Honey" album. The promo video for the single was made up of clips of footage from Lennon's other videos, as are most posthumous Lennon videos.
Document 3: Mother (John Lennon song): "Mother" is a song by English musician John Lennon, first released on his 1970 album "John Lennon/Plastic Ono Band". An edited version of the song was issued as a single in the United States on Apple Records, on 28 December 1970. The single edit runs 1:41 shorter than the album due to removing the tolling bells that start the song and a quicker fade-out. The B-side features "Why" by Yoko Ono. The song peaked in the United States at number 19 on the "Cashbox" Top 100 and number 43 on the "Billboard" Hot 100.
Document 4: Julia Murdock Smith: Julia Murdock Smith Dixon Middleton (May 1, 1831 – September 12, 1880) was an early member of the Latter Day Saint movement and the eldest surviving child and only daughter of Joseph Smith and Emma Hale Smith. She was adopted by the Smiths.
Document 5: Milk and Honey (album): Milk and Honey is the sixth and final album by John Lennon and Yoko Ono released in 1984. Following the compilation "The John Lennon Collection", it is Lennon's eighth and final studio album, and the first posthumous release of new Lennon music, having been recorded in the last months of his life during and following the sessions for his 1980 album "Double Fantasy". It was assembled by Yoko Ono in association with the Geffen label.
Document 6: Murder of John Lennon: Photographer Annie Leibovitz went to the Lennons' apartment to do a photo shoot for Rolling Stone magazine. Leibovitz promised Lennon that a photo with Ono would make the front cover of the magazine, even though she initially tried to get a picture with Lennon by himself. Leibovitz said, "Nobody wanted [Ono] on the cover". Lennon insisted that both he and his wife be on the cover, and after taking the pictures, Leibovitz left their apartment at 3:30. After the photo shoot, Lennon gave what would be his last interview, to San Francisco DJ Dave Sholin, for a music show to be broadcast on the RKO Radio Network. At 5:40, Lennon and Ono, delayed by a late limousine, left their apartment to mix the song "Walking on Thin Ice" (an Ono song featuring Lennon on lead guitar) at the Record Plant Studio.
Document 7: I'm Stepping Out: "I'm Stepping Out" is the last single from the final John Lennon and Yoko Ono album "Milk and Honey". In it, Lennon celebrates his enthusiasm for the night life of New York City, and makes tongue-in-cheek reference to his "househusband" period. It reached in the UK Singles chart, and in the US at in the US Billboard Hot 100 and number 57 on the "Cashbox" Top 100.
Document 8: Grow Old with Me: ``Grow Old with Me ''is one of the final songs written by John Lennon. It was recorded by Lennon as a demo while in Bermuda in 1980, and later appeared on the posthumous album, Milk and Honey in 1984. It was also considered as a possible reunion single by his former bandmates during the making of The Beatles Anthology.
Document 9: Julia Baird: Julia Baird (née Dykins; born 5 March 1947) is a British retired teacher and author. She is the younger half-sister of English musician John Lennon, and is the eldest daughter of his mother Julia Lennon (12 March 1914 – 15 July 1958) and John 'Bobby' Albert Dykins (1918 – December 1965). She also has an older half-sister, Ingrid Pedersen. Her younger sister is Jacqueline 'Jackie' Dykins (born 26 October 1949).
Document 10: Evelyn Einstein: Einstein was born in Chicago; after her birth she was adopted by Hans Albert Einstein. Towards the end of her life, she recounted that as a child she was told she was an illegitimate daughter of Albert Einstein and a ballet dancer; however, she had no documentation supporting this claim. She obtained a Master's degree in Medieval literature at University of California, Berkeley. She was married to Grover Krantz for 13 years from 1964 to about 1977. She then worked briefly as an animal control officer, as a cult deprogrammer, and as a Berkeley, California, reserve police officer.
Document 11: She's Always a Woman: The song was released in 1977, following several other hits from The Stranger including ``Just the Way You Are '',`` Movin 'Out (Anthony's Song)'' and ``Only the Good Die Young ''. Musically, Joel has said that he was influenced by Gordon Lightfoot and his mellow acoustic guitar ballads. It is a love song that Joel wrote for his then wife, Elizabeth Weber. Elizabeth had taken over management of Joel's career, and was able to put his financial affairs in order after Joel had signed some bad deals and contracts. She was a tough and savvy negotiator who could`` wound with her eyes'' or ``steal like a thief '', but would`` never give in''. Because of her tough - as - nails negotiating style, many business adversaries thought she was ``unfeminine, ''but to Joel, she was always a woman. The two eventually divorced in 1982.
Document 12: Lennon Legend: The Very Best of John Lennon: Lennon Legend: The Very Best of John Lennon is the third official compilation album of John Lennon's solo career, coming after 1975's "Shaved Fish" and 1982's "The John Lennon Collection". Because neither collection spanned Lennon's releases up to and including 1984's "Milk and Honey", "Lennon Legend: The Very Best of John Lennon" – considered the definitive Lennon retrospective – was compiled to rectify the situation. It was released in the UK in 1997 through Parlophone and early 1998 in the US by EMI Records.
Document 13: I'm Losing You (John Lennon song): "I'm Losing You" is a song written by John Lennon and released on his 1980 album "Double Fantasy". It was completed in Bermuda in June 1980, after Lennon failed at an attempted telephone call to Yoko Ono. The song is also available on the 1982 compilation "The John Lennon Collection", the 1998 boxset "John Lennon Anthology", the one disc compilation "Wonsaponatime", the 2005 two disc compilation "" and in 2010 for the "Gimme Some Truth" album. The song was also featured in the 2005 musical "Lennon".
Document 14: Julia Lennon: Julia Lennon (née Stanley; 12 March 1914 – 15 July 1958) was the mother of English musician John Lennon, who was born during her marriage to Alfred Lennon. After complaints to Liverpool's Social Services by her eldest sister, Mimi Smith (née Stanley), she handed over the care of her son to her sister. She later had one daughter after an affair with a Welsh soldier, but the baby was given up for adoption after pressure from her family. She then had two daughters, Julia and Jackie, with John 'Bobby' Dykins. She never divorced her husband, preferring to live as the common-law wife of Dykins for the rest of her life.
Document 15: I Dig Love: Leng draws parallels between "I Dig Love" and the Beatles' more free-form compositions of the late 1960s. Among these, Paul McCartney's "Why Don't We Do It in the Road?" exemplifies what Ian MacDonald termed in the 1990s the "long-gone let-it-all-hang-out era". In his book "Working Class Mystic", Gary Tillery identifies "I Dig Love" as one of two "All Things Must Pass" tracks (the other being "Wah-Wah") that could have been sung by John Lennon, whose style increasingly embraced provocative artistic statements following the start of his relationship with Yoko Ono in 1968. Leng also compares "I Dig Love" with "Love the One You're With", a "hymn to hedonism" by Stephen Stills, with whom Harrison worked on Doris Troy's eponymous album for Apple Records, in 1969–70.
ground_truth: Alfred Lennon
sub_queries: I'm Stepping Out >> performer Answer: John Lennon
John Lennon >> father Answer: Alfred Lennon