Question: Who is the son of the "Off the ground" singer?

full_context: Document 1: I Saw Her Standing There: Paul McCartney -- lead vocals, bass, handclaps John Lennon -- rhythm guitar, harmony vocals, handclaps George Harrison -- lead guitar, handclaps Ringo Starr -- drums, handclaps
Document 2: Getting Closer (song): "Getting Closer" is a rock song from the Anglo-American rock band Wings, Paul McCartney's post-Beatles band. The song was released on the album "Back to the Egg".
Document 3: Off the Ground (song): "Off the Ground" is a song by Paul McCartney and is from the album from the same name. The video can be seen on the DVD collection, "The McCartney Years". The video was shot by Industrial Light & Magic. Some behind the scenes footage can be seen on the out of print VHS, "Movin' On". The video features "Soggy Noodle", a short acoustic piece played as an intro which can be found as a B-side on the single release. In the US, it reached number 27 on the Adult Contemporary chart.
Document 4: Close At Hand: Close At Hand is the second EP by James McCartney, son of Paul and Linda McCartney. The EP was produced by David Kahne and Paul McCartney, and released on .
Document 5: Bringing It All Back Home: The album's cover, photographed by Daniel Kramer with an edge - softened lens, features Sally Grossman (wife of Dylan's manager Albert Grossman) lounging in the background. There are also artifacts scattered around the room, including LPs by The Impressions (Keep on Pushing), Robert Johnson (King of the Delta Blues Singers), Ravi Shankar (India's Master Musician), Lotte Lenya (Sings Berlin Theatre Songs by Kurt Weill) and Eric Von Schmidt (The Folk Blues of Eric Von Schmidt). Dylan had ``met ''Schmidt`` one day in the green pastures of Harvard University'' and would later mimic his album cover pose (tipping his hat) for his own Nashville Skyline four years later. A further record, Françoise Hardy's EP J'suis D'accord was on the floor near Dylan's feet but can only be seen in other shots from the same photo session.
Document 6: Close to Home (band): Close to Home was an American post-hardcore band from Cincinnati, Ohio, that was formed in 2005. They have released two EPs (three mixed, one demo) and three full-length albums, "Picture Perfect"; their major label debut, "Never Back Down", which was released on February 15, 2011; and their most recent effort, "Momentum", which was released July 31, 2012 via Artery Recordings. Close to Home has toured across the United States and Europe with bands such as Silverstein, Emery, Dance Gavin Dance, In Fear and Faith, We Came as Romans, and Eskimo Callboy. They have also participated in 2010 and 2012's Scream It Like You Mean It tours. On December 10, 2010, they signed with Artery Recordings; however this contract has been fulfilled. The band was previously managed by Outerloop Management. Close to Home is commonly depicted as CTH.
Document 7: Back Off Boogaloo: "Back Off Boogaloo" is a song by English rock musician Ringo Starr that was released as a non-album single in March 1972. Starr's former Beatles bandmate George Harrison produced the recording and helped Starr write the song, although he remained uncredited as a co-writer until 2017. Recording took place in London shortly after the pair had appeared together at Harrison's Concert for Bangladesh shows in August 1971. The single was a follow-up to Starr's 1971 hit song "It Don't Come Easy" and continued his successful run as a solo artist. "Back Off Boogaloo" peaked at number 2 in Britain and Canada, and number 9 on America's "Billboard" Hot 100. It remains Starr's highest-charting single in the United Kingdom.
Document 8: I Won't Back Down: The music video, directed by David Leland, was shot on March 22 and 23, 1989 on a sound stage at Pinewood Studios and released on April 24, 1989. Traveling Wilburys bandmates George Harrison and Jeff Lynne appear in the video. Mike Campbell and Harrison's former Beatles bandmate Ringo Starr are also featured in the video along with Harrison's famous painted Fender Stratocaster ``Rocky ''being played by Campbell. Starr is depicted in the video as playing the drums on the song, though drumming was actually performed by Phil Jones on the record.
Document 9: Get Back (film): Get Back is a 1991 concert film starring Paul McCartney that documents The Paul McCartney World Tour of 1989–1990. The film was directed by Richard Lester, in a return to his Beatles-related work, and was released by Carolco Pictures and New Line Cinema, through the Seven Arts joint venture.
Document 10: All Together Now: "All Together Now" is a song by the Beatles written primarily by Paul McCartney and credited to Lennon–McCartney. The song was recorded during the band's "Magical Mystery Tour" period, but remained unreleased until it was included on the "Yellow Submarine" soundtrack. It was released as a single in 1972 in European countries such as France and Germany, backed by "Hey Bulldog".
Document 11: New (Paul McCartney song): "New" is a song written by Paul McCartney. It was originally recorded by McCartney and produced by English musician Mark Ronson for McCartney's sixteenth studio album "New", and appears as the sixth track on the album. After being released early on the iTunes Store as a track available to download from "New" on 28 August 2013, the song was released as a single on 2 September 2013 and available exclusively on Amazon.com. The single's premiere on 28 August was concurrent with the official reveal of "New" on the same day. The single gained heavy airplay on Japanese radio stations, where it became a number 4 hit on the Japan Hot 100.
Document 12: Hey Jude: ``Hey Jude ''is a song by the English rock band the Beatles, written by Paul McCartney and credited to Lennon -- McCartney. The ballad evolved from`` Hey Jules'', a song McCartney wrote to comfort John Lennon's son, Julian, during his parents' divorce. ``Hey Jude ''begins with a verse - bridge structure incorporating McCartney's vocal performance and piano accompaniment; further instrumentation is added as the song progresses. After the fourth verse, the song shifts to a fade - out coda that lasts for more than four minutes.
Document 13: The Early Beatles: "The Early Beatles" is available on compact disc as part of "The Capitol Albums, Volume 2" boxed set (catalogue number CDP 0946 3 57498 2 3), in both mono and stereo. A second CD version of "The Early Beatles" with the songs in both stereo and true mono was issued in 2014 individually and part of the Beatles "The U.S. Albums" boxed set.
Document 14: Run of the Mill (George Harrison song): "Run of the Mill" is a song by English musician George Harrison, released on his 1970 triple album "All Things Must Pass". Harrison wrote the song shortly after the Beatles' troubled "Get Back" sessions in early 1969, during a period when his growth as a songwriter had inadvertently contributed to the dysfunction within the Beatles' group dynamic. The lyrics reflect the toll that running their company Apple Corps had taken on relationships within the band, especially between Paul McCartney and the other three Beatles, as well as Harrison's dismay at John Lennon's emotional withdrawal from the band. Commentators recognise "Run of the Mill" as one of several Harrison compositions that provide an insight into events behind the Beatles' break-up, particularly the difficulties surrounding Apple.
Document 15: Ground (album): Ground is the second album by the Nels Cline Trio. Initially it was to be a 7", but reviewing the demos Krown Pocket director Brian Rosser suggested an album.
ground_truth: James McCartney
sub_queries: Off the Ground >> performer Answer: Paul McCartney
Paul McCartney >> child Answer: James McCartney