Question: What boxing title did Walter Matthysse's brother hold from 2012 to 2013?

Context paragraphs:
Andrew Jeptha: Andrew Daries Jeptha (born 30 December 1879) was the first black boxer to win a British boxing title, winning the welterweight title in London on 25 March 1907.  However, Jeptha is not often recognised as the first black British boxing champion.

Lucas Matthysse: Lucas Martin Matthysse (born September 27, 1982) is an Argentine professional boxer.  He held the WBC interim super lightweight title from 2012 to 2013, and has challenged twice for a world title in 2013 and 2015.  Matthysse is known for his aggressive pressure fighting style and formidable punching power.  His older brother is former professional boxer Walter Matthysse.

Panama Joe Gans: Panama Joe Gans was a black boxer who held the World Colored Middleweight Championship for four years, shortly before it was discontinued.  Born Cyril Quinton Jr. on November 14, 1896 in Barbados, British West Indies and raised in the Panama Canal Zone, the 5'7" Quinton originally fought out of Panama and then New York City.  He took his ringname from boxing great Joe Gans, the first black American fighter to win a world boxing title.  He found his greatest fame fighting as a middleweight at between 147 and 160 lbs, but in his early career he took the Panamanian Lightweight Title and contended for the Panamanian Welterweight Title at weights roughly between 130 and 147 pounds.

Ernie Lopez: Ernie "Indian Red" Lopez (September 24, 1945 – October 3, 2009), was an American professional boxer.  He twice fought for the world welterweight boxing title, losing title bouts to José Nápoles in 1970 and 1973.  He was a missing person from 1992 to 2004 and was the subject of extensive press coverage in early 2004 when, after being selected for induction into the California Boxing Hall of Fame, he was found at a homeless shelter in Fort Worth, Texas.

Robert Dickie: Robert Dickie (23 June 1964 – 28 October 2010) was a Welsh professional boxer, fighting at both featherweight and super-featherweight.  He was Scottish champion at featherweight, British champion at both weights and became WBC International super-featherweight champion in 1988.  He is one of only four Welshmen to hold a British boxing title at different weights, the others being Johnny Basham, Pat Thomas and Jack Petersen.

Gene Schoor: Eugene R. (Gene) Schoor (July 26, 1914 – December 13, 2000) was a New York-based author, journalist, ghost-writer, college boxing instructor (New York University, the University of Minnesota, and City College of New York), Florida state amateur boxing title holder, Navy Public Information Officer, public relations man, sports agent, boxing promoter, and restaurateur.  He is best known as the author of "juvenile" sports biographies.

Zolani Marali: Zolani Marali is a South African lightweight boxer (born 5 May 1977).  He was born in Eastern Cape, South Africa.  Marali won a bronze medal in the flyweight category at the 1999 All-Africa Games in Johannesburg.  In April 2009, he won the International Boxing Organization (IBO) superfeatherweight boxing title after defeating Gamaliel Diaz.  He had previously won the titles for World Boxing Foundation super bantamweight and super featherweight as well as IBO super bantamweight.

Gentiane Lupi: Gentiane Lupi (born October 26, 1975, Wellington, New Zealand) is a New Zealand professional boxer, kickboxer, MMA and Muay Thai fighter.  Lupi is also the former Women's International Boxing Association World super bantamweight champion and also the third New Zealand born person to have held a world boxing title.  Lupi currently holds the WBA Oceania Super Featherweight Title.

Billy Petrolle: William "Billy" Michael Petrolle (January 10, 1905 – May 14, 1983) was a world lightweight boxing title contender.  Boxing ran in the Petrolle family as his brothers Pete and Frank also shared his occupation.  Statistical boxing website BoxRec lists Petrolle as the #18 ranked lightweight of all-time.  Petrolle is member of the Minnesota Boxing Hall of Fame, the Ring Magazine Hall of Fame, the World Boxing Hall of Fame, and the International Boxing Hall of Fame.

Walter Matthysse: Walter Dario Matthysse (born August 29, 1978) is an Argentine former professional boxer who competed from 2002 to 2009, and challenged once for the IBF welterweight title in 2007.  He is the elder brother of professional boxer Lucas Matthysse.

Supporting paragraphs: Walter Matthysse Lucas Matthysse
Answer: WBC interim super lightweight title