Information:  - Rickson Gracie (born November 21, 1958) is a Brazilian 8th degree black and 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.  - The Gracie family is a prominent martial arts family from Brazil known for their development of Brazilian jiu-jitsu (BJJ). They have been successful in combat sport competitions including mixed martial arts, vale tudo, and submission wrestling events. As a family, they uphold the Gracie challenge, which promotes their style of modern jiu-jitsu. Members are affinally and consanguineously related to the Machado family.  - The Machado Familyalso known as the Machado Brothersare a family of Brazilian jiu-jitsu practitioners, mixed martial artists and grapplers. They are the founders of RCJ Machado Brazilian Jiu-Jitsu and are cousins to members of the Gracie family. Their familial ties to the Gracies are through their mother's sister Layr, who was married to Carlos Gracie, making them first cousins to Carlos Gracie, Jr. and his siblings, and affinal cousins to the rest of the second generation of Gracie martial artists. Along with their Gracie cousins, the Machados are pioneers of Brazilian Jiu-Jitsu in the United States. They are according to age, Carlos, Roger, Rigan, Jean Jacques and John. The Machados have opened Brazilian jiu-jitsu schools throughout the United States.  - Royler Gracie (born December 6, 1965) is a retired Brazilian mixed martial artist and Brazilian jiu-jitsu practitioner. He ran the Gracie Humaitá school in Rio de Janeiro, Brazil for many years under his father Helio's direction, but currently lives in San Diego.  - Brazil, officially the Federative Republic of Brazil, is the largest country in both South America and Latin America. As the world's fifth-largest country by both area and population, it is the largest country to have Portuguese as an official language and the only one in the Americas. Bounded by the Atlantic Ocean on the east, Brazil has a coastline of . It borders all other South American countries except Ecuador and Chile and covers 47.3% of the continent's land area. Its Amazon River basin includes a vast tropical forest, home to diverse wildlife, a variety of ecological systems, and extensive natural resources spanning numerous protected habitats. This unique environmental heritage makes Brazil one of 17 megadiverse countries, and is the subject of significant global interest and debate regarding deforestation and environmental protection.  - The Gracie challenge was an open invitation issued by some members of the Brazilian Gracie family, known for their Brazilian jiu-jitsu (BJJ) mastery, to martial artists of other styles to fight them in a vale tudo match. A precursor to the Ultimate Fighting Championship (UFC), the purpose of these challenges was to prove the effectiveness of the Gracie style of BJJ. Challenges have been issued since Carlos Gracie first made one in the 1920s with some becoming public events while others have remained private.  - Rorion Gracie (born 1952) is a Brazilian American Gracie Jiu-Jitsu Grand Master, a prominent member of the Gracie family, writer, publisher, producer, lecturer, and the co-founder of the Ultimate Fighting Championship. He is the oldest son of Hélio Gracie and one of the few people in the world to hold a 9th degree red belt in Brazilian Jiu-Jitsu, and is widely recognized as the man responsible for introducing Gracie/Brazilian Jiu-jitsu to the United States and the world.  - Hélio Gracie (October 1, 1913  January 29, 2009) was a Brazilian martial artist who, together with his brother Carlos Gracie, founded the martial art of Gracie jiu-jitsu and with Luiz França and Oswaldo Fadda the martial art of Brazilian jiu-jitsu (BJJ). According to Rorion Gracie, his father Hélio is one of the first sports heroes in Brazilian history; he was named Man of the Year in 1997 by the American martial arts publication "Black Belt" magazine. A patriarch of the Gracie family, he was the father of Rickson, Royler, Royce, Relson, and Ultimate Fighting Championship (UFC) co-founder Rorion Gracie, among other sons and daughters. According to one of his most notable opponents, Masahiko Kimura, Gracie held the rank of 6th "dan" in judo.  - Relson "Campeão" Gracie is a retired professional Brazilian Jiu-Jitsu fighter and martial arts personality. He is a member of the Gracie family. Relson currently lives in Hawaii where he still teaches Gracie Jiu-Jitsu at his academy in Honolulu. There are many Relson Gracie affiliated academies and associations throughout the U.S. which keep him traveling regularly.  - Patrick Jay "Pat" Miletich (born March 9, 1966) is a retired American mixed martial artist and a current sports commentator. He is known for his fights in the Ultimate Fighting Championship, where he became the first UFC Welterweight Champion and UFC 16 Welterweight Tournament Winner. Miletich is also known as a highly successful trainer and coach, having founded Miletich Fighting Systems. This camp is considered one of the most successful in MMA history and has produced several world champions. On July 6, 2014, he was inducted into the UFC Hall of Fame.  - Ralek Gracie ( / hlk ræsi / ; born October 4 , 1985 ) is a Brazilian Jiu - Jitsu practitioner and mixed martial artist . He is the son of Rorion Gracie and a member of the Gracie family , and is the nephew of former UFC Champion Royce Gracie and Rickson Gracie . He was awarded his Black Belt in Brazilian Jiu - Jitsu by his grandfather Helio Gracie . He is also the founder of Metamoris , a promotion that features 20 - minute , submission - only grappling matches against the world 's best jiu - jitsu stylists .  - Royce Gracie (born December 12, 1966) is a Brazilian professional mixed martial artist for Bellator MMA , a UFC Hall of Famer, and a Brazilian Jiu-Jitsu practitioner. He is considered by UFC fans to be the most influential figure in the history of modern MMA. He is a member of the Gracie family.  - A combat sport, or fighting sport, is a competitive contact sport with one-on-one combat. Determining the winner depends on the particular contest's rules. In many fighting sports, a contestant wins by scoring more points than the opponent or by disabling the opponent. Boxing, wrestling, Muay Thai, Tae Kwon Do, Judo, Brazilian Jiu-jitsu, Sambo, and Mixed Martial Arts are examples of combat sports.  - Martial arts are codified systems and traditions of combat practices, which are practiced for a number of reasons: as self-defense, military and law enforcement applications, mental and spiritual development; as well as entertainment and the preservation of a nation's intangible cultural heritage.  - Brazilian jiu-jitsu (BJJ) is a martial art, combat sport system that focuses on grappling and especially ground fighting. Brazilian jiu-jitsu was formed from Kodokan judo ground fighting (newaza) fundamentals that were taught by a number of individuals including Takeo Yano, Mitsuyo Maeda and Soshihiro Satake. Brazilian jiu-jitsu eventually came to be its own art through the experiments, practices, and adaptation of judo through Carlos and Helio Gracie (who passed their knowledge on to their extended family) as well as other instructors who were students of Maeda, such as Luiz Franca.    Given the information, choose the subject and object entities that have the relation of 'member of'.
The answer to this question is:
ralek gracie , gracie humaitá