Question:  That's Rock 'N' Roll Live was an album of the concert tour of a teen-idol sensation, American television producer/creator and screenwriter whose older half-brother is who?
Context: Rock 'n' Roll is the sixth studio album by John Lennon.  Released in 1975, it is an album of late 1950s and early 1960s songs as covered by Lennon.  Recording the album was problematic and spanned an entire year: Phil Spector produced sessions in October 1973 at A&M Studios, and Lennon produced sessions in October 1974 at Record Plant Studios (East).  Lennon was being sued by Morris Levy over copyright infringement of one line in his song "Come Together".  As part of an agreement, Lennon had to include three Levy-owned songs on "Rock 'n' Roll".  Spector disappeared with the session recordings and was subsequently involved in a motor accident, leaving the album's tracks unrecoverable until the beginning of the "Walls and Bridges" sessions.  With "Walls and Bridges" coming out first, featuring one Levy-owned song, Levy sued Lennon expecting to see Lennon's "Rock 'n' Roll" album. "Rock 'n' Roll Star" is a song by English rock band Oasis.  It is the opening track from their record breaking debut album, "Definitely Maybe".  Like the majority of the band's songs from this era, it was written by lead guitarist Noel Gallagher.  Noel said that "Rock 'n' Roll Star" was one of only three songs in which he wanted to say something: "I've pretty much summed up everything I wanted to say in "Rock 'n' Roll Star", "Live Forever" and "Cigarettes & Alcohol", after that I'm repeating myself, but in a different way".  It became a fan favourite and was often played to close the band's gigs. It's Only Rock 'n Roll is the 12th British and 14th American studio album by The Rolling Stones, released in 1974.  It was the last Rolling Stones album for guitarist Mick Taylor and the songwriting and recording of the album's title track had a connection to Taylor's eventual replacement, Ronnie Wood.  The album also marked the 10th anniversary since the release of the band's debut album, "The Rolling Stones".  "It's Only Rock 'n Roll" has a firmer rock sound than the band's previous album, the more funk - and soul - inspired "Goats Head Soup".  "It's Only Rock 'n Roll" reached #1 in the US and #2 in the UK. To capture the sensation of teen-idol Shaun Cassidy, Warner Bros.  Records released a live album of his 1979 concert tour named That's Rock 'N' Roll Live.  The album featured tracks from his four studio albums ("Shaun Cassidy", "Born Late", "Under Wraps" and the then-forthcoming album "Room Service").  The album also featured a cover of The Righteous Brothers' hit song, "You've Lost That Lovin' Feelin'". Shaun Paul Cassidy (born September 27, 1958) is an American television producer/creator, screenwriter, and former singer and actor.  He is the eldest son of Shirley Jones and Jack Cassidy.  His older half-brother is David Cassidy. "I Hate Rock 'n' Roll" is a song by the Scottish alternative rock group The Jesus and Mary Chain.  It was the first single from the band's compilation album, "Hate Rock 'n' Roll".  It was released together with 3 other tracks by Blanco y Negro Records in June 1995 and reached #61 in the UK single charts.  This release was the last release for the band on this label.  The 10" format was numbered and limited to 5000 copies.  The reworked version of the track, which was dubbed as "I Love Rock 'n' Roll" was also included on the group's last album "Munki", released in 1998. What's Next to the Moon is a solo album by Mark Kozelek, released on January 10, 2001.  The album is composed entirely of drastically rearranged acoustic covers of Bon Scott-era AC/DC songs.  The album follows the release of his debut solo EP "Rock 'n' Roll Singer", which also features three AC/DC covers: "Rock 'n' Roll Singer," "You Ain't Got a Hold on Me," and "Bad Boy Boogie."  The versions of "Rock 'n' Roll Singer" and "Bad Boy Boogie" on this album are different from the versions on the EP. Rock 'n' Roll Circus is the eleventh studio album by Japanese recording artist Ayumi Hamasaki.  It was released on April 14, 2010, by Avex Trax.  It was also released just a little over a year after her 2009 album, "Next Level".  "Rock 'n' Roll Circus" marks Hamasaki's eleventh consecutive album to be fully produced by Japanese producer and manager Max Matsuura, while she contributes to the album as the lead vocalist, background vocalist, and songwriter to all songs.  Recorded in Japanese with minor phrases in English, "Rock 'n' Roll Circus" is a rock album with numerous musical elements such as electropop, J-pop, rock, pop ballad, and dance music. Just... Fabulous Rock 'n' Roll is a studio album by Cliff Richard, released 11 November 2016.  The album continues the rock 'n' roll theme of his previous studio album "The Fabulous Rock 'n' Roll Songbook".  It comprises covers of 14 classic rock 'n' roll songs and one new song "It's Better to Dream".  It features Elvis Presley in duet with Richard in "Blue Suede Shoes" and Peter Frampton on guitar in "Dimples".  The album reached number 4 on the UK Albums Chart and has been certified Gold for sales over 100,000 in the UK. World Rock 'n' Roll Confederation (WRRC) was registered in 1984, although its history traces to 1974.  It is an umbrella organization for national professional and amateur Rock and Roll dancesport federations.  Its statute that it "aims at promoting the physical training of its members by means of sporting activities in the form of Rock 'n' Roll dance tournaments, including the acrobatic variations (acrobatic rock 'n' roll) as well as Rock 'n' Roll and Boogie Woogie, Lindy Hop, Formation and alternative styles in line with the rules and sporting presentations".  The registered office is in Ljubljana, Slovenia.
Answer: David Cassidy