Question: Who besides Liam is the brother of the current WBC Silver super featherweight champion?

Context paragraphs:
Justin Juuko: Justin "The Destroyer" Juuko (born 26 December 1972 in Masaka) is a Ugandan amateur light flyweight and professional feather/super feather/light/light welter/welterweight boxer of the 1990s, 2000s and 2010s who as an amateur won the gold medal at light flyweight in the Boxing at the 1990 Commonwealth Games in Auckland, New Zealand, and as a professional won the World Boxing Council (WBC) International super featherweight title, World Boxing Council (WBC) FECARBOX super featherweight title, African Boxing Union (ABU) light welterweight title, North American Boxing Federation (NABF) super featherweight title, and Commonwealth super featherweight title, and was a challenger for the interim World Boxing Association (WBA) World super featherweight title against Antonio Hernandez, World Boxing Council (WBC) super featherweight title against Floyd Mayweather, Jr., International Boxing Association (IBA) super featherweight title against Diego Corrales, World Boxing Union (WBU) super featherweight title against Michael Gomez, International Boxing Association (IBA) lightweight title against Rustam Nugaev, Global Boxing Union (GBU) light welterweight title against Gábor Vető, his professional fighting weight varied from 125 lb , i.e. featherweight to 143 lb , i.e. welterweight.

Alberto Garza: Alberto Jesús Garza (born June 6, 1985 in Mexico City, Distrito Federal, Mexico) is a Mexican professional boxer in the Featherweight division.  He's the current WBC Silver Featherweight Champion.

Liam Smith (boxer): Liam Smith (born 27 July 1988) is a British professional boxer.  He held the WBO light-middleweight title from 2015 to 2016, having previously held the Commonwealth light-middleweight title from 2012 to 2013, and the British light-middleweight title from 2013 to 2015.  Liam is the younger brother of Paul Smith and Stephen Smith, and the older brother of Callum Smith; all of whom are also professional boxers.

Eduardo Escobedo: Eduardo Felipe Escobedo Mateo (born February 4, 1984 in Mexico City, Distrito Federal, Mexico) is a Mexican professional boxer in the Super Featherweight division and is the current WBC Silver Super Featherweight Champion.

Juan Carlos Salgado: Juan Carlos Salgado (born December 20, 1984 in Mexico City, Distrito Federal, Mexico) is a Mexican professional boxer in the Super Featherweight division.  He is the former WBC FECARBOX, WBC Continental Americas Featherweight, and WBA Super Featherweight Champion.  He won the vacant IBF Super Featherweight title on September 10, 2011 against Argenis Mendez.

Stephen Smith (boxer): Stephen Francis Smith (born 22 July 1984 is a British professional boxer.  He is the current WBC Silver super featherweight champion and a former British featherweight and British super featherweight champion, he is also a former Commonwealth featherweight champion.

Marco Antonio López: Marco Antonio López Balderas (born May 6, 1987 in San Luis Potosí, San Luis Potosí, Mexico) is a Mexican professional boxer.  He fights in the Super Featherweight division, and is the current WBC Youth Intercontinental Super Featherweight Champion.

Sylvester Lopez: Sylvester Lopez, born as Silvester Lopez on October 26, 1987, is a Filipino professional boxer who is the current WBC Silver Super Flyweight Champion and is also the former WBC International Super Flyweight Champion.

Nedal Hussein: Nedal "Skinny" Hussein (born 1 December 1977) is an Australian professional bantam/super bantam/feather/super feather/Lightweight boxer of the 1990s and 2000s who won the Australian super bantamweight title, Australian bantamweight title, International Boxing Federation (IBF) Pan Pacific featherweight title, World Boxing Federation (WBF) featherweight title, World Boxing Union (WBU) super bantamweight title, World Boxing Organization (WBO) Asia Pacific super featherweight title, International Boxing Federation (IBF) Pan Pacific super featherweight title, International Boxing Organization (IBO) Inter-Continental super featherweight title, and Commonwealth super bantamweight title, and was a challenger for the World Boxing Council (WBC) International super bantamweight title against Manny Pacquiao, World Boxing Council (WBC) super bantamweight title against Óscar Larios, World Boxing Organization (WBO) featherweight title against Scott Harrison, Oriental and Pacific Boxing Federation (OPBF) featherweight title against Hiroyuki Enoki, and Oriental and Pacific Boxing Federation (OPBF) super featherweight title against Takashi Uchiyama, his professional fighting weight varied from 117+1/4 lb , i.e. bantamweight to 132+3/4 lb , i.e. lightweight.

Gamaliel Díaz: Gamaliel Díaz Magaña (born February 14, 1981 in Tacámbaro, Michoacán, Mexico) is a Mexican professional boxer in the Super Featherweight division and the former WBC Super Featherweight champion.  He is also the former NABF Featherweight, WBC Continental Americas Lightweight, and is the current WBC CABOFE Super Featherweight Champion.

Supporting paragraphs: Liam Smith (boxer) Stephen Smith (boxer)
Answer: Paul Smith