Question: What is Juan García Ábrego's uncle's nickname?

Context articles: Juan García Ábrego
Juan Garcia (guitarist)
Jorge de Juan
Juanín García
Juan Nepomuceno Guerra
Juan García de Miranda
Osiel Cárdenas Guillén
Juan García Hortelano
Eduardo Mendoza Garriga
Juan Carlos García Sancho

Juan García Ábrego (born September 13, 1944) is a former Mexican drug lord who started out his criminal career under the tutelage of his uncle Juan Nepomuceno Guerra, who is reported to be the former head of a criminal dynasty along the U.S.-Mexico border now called the Gulf Cartel.
Juan García ( born November 24, 1963 ) is a Cuban American heavy metal guitarist.
 He is perhaps best known as the guitarist for the thrash metal bands Agent Steel and Evildead and the power metal/speed metal band Abattoir.
 García is also the rhythm guitarist of Body Count.
Jorge de Juan García (born 6 June 1961) is a Spanish film and theatre actor, producer and director, known artistically as Jorge de Juan.
Juan García Lorenzana, known as Juanín García, (born 28 August 1977, in León) is a Spanish handball player.
 He currently plays for Barcelona, with whom he won the Champions League in 2011 in the finale against Ciudad Real.
Juan Nepomuceno Guerra Cárdenas (July 18, 1915 – July 12, 2001) was a Mexican crime lord, bootlegger, businessman and smuggler who founded the Gulf Cartel, a drug trafficking organization.
 He is often considered the "godfather" of U.S-Mexico border cartels.
Juan García de Miranda (1677–1749), was a Spanish painter of the baroque period, a disciple of Juan Delgado and the uncle of Pedro Rodriguez de Miranda.
 He was appointed Painter to the King.
Osiel Cárdenas Guillén (born May 18, 1967) is a former Mexican drug lord and the former leader of the Gulf Cartel (Spanish: "Cártel del Golfo" ) and Los Zetas.
 Originally a mechanic in Matamoros, Tamaulipas, where he was born, he entered the Gulf Cartel by helping Juan García Abrego, the capo at the time; when García Ábrego was arrested in 1996, some infighting erupted within the cartel.
 Osiel Cárdenas eventually took control by killing his friend and contender Salvador Gómez, earning Cárdenas the nickname ""El Mata Amigos"" (The Friend-Killer).
Juan García Hortelano (1928–1992) was a Spanish writer.
 He was born in Madrid on Valentine's Day 1928.
 His father was a doctor.
 When the Spanish Civil War broke out, he was sent with his siblings to Cuenca, only returning to Madrid in 1937 where he lived with his maternal grandparents.
 The libraries at school and home turned him into an avid reader.
 Following the war, he entered college in 1941, later studying law at Madrid University.
 He joined the Civil Service in 1953.
 Throughout his life, he dedicated himself to writing with fervour and discipline without abandoning his administrative job in Madrid.
 He cultivated friendships with writers and intellectuals of his generation: Juan Benet, Carlos Barral, Jaime Gil de Biedma, Juan Marsé and Ángel González.
Eduardo Mendoza Garriga (born 11 January 1943 in Barcelona, Spain) is a Spanish novelist.
 He studied law in the first half of the 1960s and lived in New York City between 1973 and 1982, working as interpreter for the United Nations, and then tried to become a lawyer and then he realized that he wanted to be a writer.
 He maintained an intense relationship with novelists Juan Benet and Juan García Hortelano, poet Pere Gimferrer and writer (and neighbour) Félix de Azúa.
Juan Carlos García Sancho Orozco (born November 10, 1994 in Tepic, Nayarit), known as Juan García Sancho, is a professional Mexican footballer who currently plays for Cruz Azul.