Question: The two children of Cassius Marcellus Clay Sr. and Odessa Grady Clay was a three-time World Heavyweight Champion and who?
Context: Cassius Marcellus Clay ( ; October 19, 1810 – July 22, 1903), nicknamed the "Lion of White Hall", was a Kentucky planter, politician, and emancipationist who worked for the abolition of slavery.  He freed the slaves that were handed down as his inheritance from his father.  Those freed slaves were allowed to stay and were paid a wage.  He was appointed by President Abraham Lincoln as the United States minister to Russia during the American Civil War, and is credited with gaining Russian support for the Union. Facing Ali is a 2009 documentary directed by Pete McCormack about Muhammad Ali (born Cassius Marcellus Clay, Jr. in Louisville, Kentucky) as told from the perspectives of some of the notable opponents he faced during his career: George Chuvalo, Sir Henry Cooper, George Foreman, "Smokin'" Joe Frazier, Larry Holmes (a former sparring partner of Ali), Ron Lyle, Ken Norton, Earnie Shavers, Leon Spinks and Ernie Terrell. Brutus Junius Clay (July 1, 1808 – October 11, 1878) was a U.S. Representative from Kentucky, and a son of Green Clay.  His brother Cassius Marcellus Clay also was a politician in the state, and they both joined the Unionist Party at the time of the American Civil War. Terry Michael Brunk (born December 12, 1964) is an American professional wrestler, known by his ring name Sabu, who portrays an Arab American (to which he is half-Lebanese) in the ring.  He is well known for his extreme wrestling style.  Brunk has most notably competed in Extreme Championship Wrestling, Total Nonstop Action Wrestling and World Wrestling Entertainment's ECW brand.  He is currently the X-LAW International Champion and is employed by Juggalo Championship Wrestling.  Brunk is a three-time world heavyweight champion, having held the ECW World Heavyweight Championship- twice and the NWA World Heavyweight Championship once. Odessa Lee Clay (née O'Grady; February 12, 1917 – August 20, 1994) was the mother of three-time World Heavyweight Champion Muhammad Ali and Rahman Ali, and the grandmother of Laila Ali.  She married Cassius Marcellus Clay, Sr. in the 1930s and worked for some time as a household domestic to help support her young children. The Soul of a Butterfly is the autobiography of Muhammad Ali, born Cassius Marcellus Clay Jr., a former heavyweight boxer who was a three time World Heavyweight Champion and is the greatest heavyweight of all time. The UWA World Heavyweight Championship ("Campeonato Mundial peso Completo de UWA" in Spanish) is a professional wrestling world heavyweight championship originally promoted by Universal Wrestling Association (UWA) until it closed in 1995 and since then been defended on the Mexican independent circuit.  In the past the title has been defended in Consejo Mundial de Lucha Libre (CMLL) and Asistencia Asesoría y Administración (AAA) when the champion worked for those companies.  Lou Thez was the first UWA World Heavyweight champion, having been awarded the title after wrestling Mil Mascaras to a draw on the very first UWA show.  El Canek has held the Championship the most times, 15 reigns all in all, 13 of those before the UWA closed.  Canek is also the champion that kept the UWA World Heavyweight Championship active after the UWA closed.  Dr. Wagner, Jr. is the current UWA World Heavyweight champion having defeated Canek on June 18, 2004.  Dr. Wagner, Jr. currently works regularly for AAA and they acknowledge the title, having shown him with the belt on numerous occasions. Botherum was built for Madison C. Johnson in 1850 or 1851 (sources vary) by John McMurtry, a well-known architect and builder based in Lexington.  The house was intended, in part, as a shrine to Johnson's late wife Sally Ann, a sister of Cassius Marcellus Clay who died giving birth in 1828. Muhammad Ali ( ; born Cassius Marcellus Clay Jr.; January 17, 1942 – June 3, 2016) was an American professional boxer and activist.  He is widely regarded as one of the most significant and celebrated sports figures of the 20th century.  From early in his career, Ali was known as an inspiring, controversial, and polarizing figure both inside and outside the ring. Cassius Marcellus Clay (November 11, 1912 – February 8, 1990) was an American painter and musician.  He was the father of three-time World Heavyweight Champion Muhammad Ali and Rahman Ali, and the grandfather of Laila Ali.  He married Odessa Lee O'Grady in the 1930s and worked as a painter and a musician.  He was described as "a handsome, mercurial, noisy, combative failed dreamer" and a "hard-drinking, skirt-chasing dandy of a daddy".  His son Muhammad Ali described him as "the fanciest dancer in Louisville".
Answer: Rahman Ali