Question: Ralek Gracie is the nephew of a retired mixed martial artist who was born in which year ?

full_context: Document 1: Ralph Gracie: Ralph Gracie (the Pitbull; born May 25, 1971) is a Brazilian martial artist who has competed in mixed martial arts. He is the son of Robson Gracie and brother to Charles Gracie, Renzo Gracie and the late Ryan Gracie of the Gracie family.
Document 2: Kazushi Sakuraba: Kazushi Sakuraba (桜庭 和志 , Sakuraba Kazushi , born July 14, 1969) is a Japanese mixed martial artist and professional wrestler, currently signed to Rizin Fighting Federation. He has competed in traditional puroresu for New Japan Pro Wrestling and shoot-style competition for UWFi and Kingdom Pro Wrestling. He has fought in MMA competition in the Ultimate Fighting Championship, Pride Fighting Championships, Hero's and Dream. He is known as the "Gracie Hunter" or the "Gracie Killer" due to his wins over four members of the famed Gracie family: Royler Gracie, Renzo Gracie, Ryan Gracie, and Royce Gracie. In particular, Sakuraba is famous for his initial fight with Royce, which lasted ninety minutes.
Document 3: Renato Sobral: Renato da Cunha Sobral (] ; born September 7, 1975), also known as "Babalu", is a retired Brazilian wrestler and mixed martial artist, and former Strikeforce Light Heavyweight Champion. Sobral previously fought in the Ultimate Fighting Championship, where he posted a 6–4 record and has also competed for Bellator, RINGS, Jungle Fight, Cage Rage, Affliction, and ONE FC. He is the Head Instructor of Babalu's Iron Gym Cerritos and has a Luta Livre black belt. He is also a Brazilian jiu-jitsu black belt under Carlos Gracie Jr. In his prime he was considered one of the top fighters in the world and defeated the likes of former Welterweight UFC Champion Robbie Lawler, former Light Heavyweight UFC Champion Shogun Rua, former Heavyweight UFC Champion Maurice Smith, along with former title contenders Chael Sonnen, Elvis Sinosic, and Jeremy Horn.
Document 4: Rodrigo Gracie: Rodrigo Gracie (born March 11, 1975) is a retired Brazilian mixed martial artist and Brazilian Jiu-Jitsu practitioner. A member of the famous Gracie family, Rodrigo is a 5th Degree Black Belt in Gracie Jiu-Jitsu and a Gold Medalist in the 1998 ADCC Submission Wrestling World Championship. While competing in PRIDE Fighting Championships, Gracie was ranked amongst the top Middleweight fighters from 2003 to 2004 due to an undefeated streak with consecutive victories over Hayato Sakurai, Daiju Takase, Yuki Sasaki, and Daijiro Matsui.
Document 5: Alliance Jiu Jitsu: Alliance (pronounced "ah-lee-AHN-say" from the Brazilian origin, but "uh-LAHY-uhns" in the American/English form) is one of the most prominent Brazilian Jiu-Jitsu associations and the current defending World team champion, having won the titles at the World Championships from 2008-2016. They also won the World Championships back to back in 1998 and 1999. Alliance was founded by Romero "Jacare" Cavalcanti and his students: Fabio Gurgel, Alexandre Paiva, and Fernando Gurgel. Alliance Global headquarters is in Atlanta, Georgia at the Alliance Martial Arts Academy, where "Jacare" is the head instructor. Fabio Gurgel, also known as the "General", is the co-leader of Alliance and the head instructor at Alliance Sao Paulo (Sao Paulo, Brazil). Alexandre "Gigi" Paiva heads the third main Alliance academy in Rio de Janeiro, Brazil.
Document 6: Roger Gracie: Roger Gracie Gomes (born September 26, 1981) is a Brazilian Jiu-Jitsu practitioner and mixed martial artist. A member of the Gracie family, he is the son of Reila Gracie (daughter of Carlos Gracie) and Mauricio Motta Gomes. Roger was awarded his black belt by his cousin Renzo Gracie at the behest of Carlos Gracie, Jr. whilst training in New York in 2003. He is currently a third degree black belt. Roger Gracie is the founder and head instructor at The Roger Gracie Academy located in Kensington, London, England. Notable Black belt promotions include Raymond Stevens (judoka), Nick Gregoriades & Kywan Gracie Behring. Roger is also an active mixed martial arts competitor and is the current ONE World Cruiserweight Champion.
Document 7: KHK MMA: The Khalid Bin Hamad Al Khalifa Mixed Martial Arts (KHK MMA) is a martial arts organization based in Bahrain. It was founded under the patronage of His Highness Khalid bin Hamad Al Khalifa for its current CEO and professional MMA fighter Mohammed "The Hawk" Shahid in February 2015. Fighters competing under KHK MMA banner include: former UFC lightweight champion Frankie Edgar, UFC lightweight contender Khabib Nurmagomedov, UFC lightweight fighter Islam Makhachev, Bellator fighter James Gallagher, 2-time IMMAF champion Jose "Shorty" Torres, former UFC fighter and current Titan FC contender Alex Soto, and current Desert Force fighter Hamza Kooheji. KHK MMA activities include: coaching pro fighters, developing amateur MMA, promoting martial arts events, fitness gyms, and a sports gear brand.
Document 8: Mackenzie Dern: Mackenzie Lynne Dern (born March 24, 1993) is a Brazilian Jiu-Jitsu practitioner and mixed martial artist. IBJJF ranks Mackenzie as the number one female black belt in brazilian jiu-jitsu. She holds a black belt under her father, Wellington "Megaton" Dias who is one of the top Brazilian jiu-jitsu black belts in the world. She is an ADCC and no gi BJJ (black belt) World Champion.
Document 9: Robin Gracie: Robin Gracie is a Brazilian professional mixed martial artist and Brazilian Jiu-Jitsu practitioner. Robin is the youngest son of Hélio Gracie. He currently resides in Barcelona and runs the official Gracie Jiu-Jitsu Academy of Spain and teaches seminars throughout Europe and North America. He was a Vale Tudo competitor and was a 1998 ADCC Submission Wrestling World Championship Silver Medalist. Robin was trained by his father Hélio, and his brothers Royler Gracie, Rolker Gracie and Royce Gracie. Robin is also notable for a widely published no holds barred fight he took within his own academy, in what was part of one of the first "Gracie Challenge", against French journeyman fighter and black belt in BJJ, Damien Riccio in 2001.
Document 10: Ralek Gracie: Ralek Gracie ( ; born October 4, 1985) is an American Brazilian jiu-jitsu practitioner and mixed martial artist. As the son of Rorion Gracie, he is a member of the Gracie family, and the nephew of Legends of MMA Hall of Famer Rickson Gracie and UFC Hall of Famer Royce Gracie. He was awarded his black belt in Brazilian jiu-jitsu by his grandfather Hélio Gracie. He is also the founder of Metamoris, a submission-only grappling promotion.
Document 11: Rickson Gracie: Rickson Gracie (] ; born November 21, 1958) is a Brazilian 9th degree red belt in Gracie Jiu-Jitsu and a retired mixed martial artist. He is a member of the Gracie family: the son of Hélio Gracie, brother to Rorion and Relson Gracie, and half-brother to Rolker, Royce, Robin and Royler Gracie. In November 2014 he became an inductee of the Legends of MMA Hall of Fame, alongside Big John McCarthy, Pat Miletich, and Fedor Emelianenko.
Document 12: Murilo Rua: Murilo "Ninja" Milani Rua (] ; born May 22, 1980) is a retired Brazilian mixed martial artist who fought in Pride Fighting Championships. He is the older brother of former UFC Light Heavyweight Champion Mauricio "Shogun" Rua. He is known for his aggressive Muay Thai style. Rua is a veteran of Pride Fighting Championships, where he once enjoyed a reputation as one of the best middleweights in the world. Rua regularly fought at 185 pounds, but has also fought at 205 pounds and heavyweight. He is the former (and first ever) EliteXC Middleweight Champion. He also had a successful career in mixed martial arts in England appearing on both Cage Rage and BAMMA cards. He is of Portuguese and Italian descent, but was born in Brazil.
Document 13: Renzo Gracie: Renzo Gracie ( ; ] ; born March 11, 1967) is a Brazilian mixed martial artist and Brazilian Jiu-Jitsu practitioner. A member of the Gracie family of Brazil, Renzo is a 6th Degree Black in Brazilian Jiu-Jitsu under Carlos Gracie Jr.. He is the son of Robson Gracie, grandson of Carlos Gracie, nephew of Carlos Gracie, Jr. grandnephew of Helio Gracie, and the 1st cousin once removed of Royce Gracie. In mixed martial arts, Renzo has competed in the Ultimate Fighting Championship, Pride Fighting Championships, K-1, RINGS, and International Fight League (head-coaching the New York Pitbulls). He holds notable victories over five former UFC Champions: Frank Shamrock (UFC Light Heavyweight Champion), Carlos Newton (UFC Welterweight Champion), Pat Miletich (UFC Welterweight Champion), Maurice Smith (UFC Heavyweight Champion), and Oleg Taktarov (UFC 6 Tournament Winner)
Document 14: Rani Yahya: Rani Ahmad Yahya (born September 12, 1984) is a Brazilian mixed martial artist and BJJ practitioner. Yahya was born to a Syrian father and Brazilian mother. He won the 66 kg division of the prestigious ADCC Submission Wrestling World Championship in April 2007. He currently fights in the Bantamweight division of the Ultimate Fighting Championship.
Document 15: Neil Melanson: Neil Melanson is an American combat sports coach, currently he is the Head Grappling coach at Jaco Hybrid Training Center. He is the former Head Grappling coach at both Xtreme Couture Las Vegas and Alliance MMA. Melanson specializes in Catch wrestling, while drawing elements from Judo. He is especially known for his guard work, leg locks and triangle chokes. He has trained under Gene LeBell, Gokor Chivichyan, and Karo Parisyan (who awarded him his black belt).
ground_truth: 1958