question: Julio César Chávez Jr.'s younger brother was born in what year?
answer: 1990
context: Title: Julio César Chávez Jr. vs. Sebastian Zbik
  Passage: Julio César Chávez Jr. vs. Sebastian Zbik was a Middleweight championship fight for the WBC Middleweight Championship.  It has been the first time that the son of legendary boxing Champion Julio César Chávez, fought for a world title, Chávez went on to become the new WBC Middleweight Champion.  The bout was on June 4th, 2011, at Staples Center, in Los Angeles, California and was broadcast on HBO.
  Title: Omar Chávez
  Passage: Omar Alonzo Chávez Carrasco (born January 4, 1990), best known as Omar Chávez, is a Mexican professional boxer and the current WBC Youth Intercontinental welterweight champion.
  Title: Julio César Chávez Jr.
  Passage: Julio César Chávez Carrasco (born February 16, 1986), best known as Julio César Chávez Jr., is a Mexican professional boxer who held the WBC middleweight title from 2011 to 2012.  He is the son of retired six-time world boxing champion Julio César Chávez and older brother of Omar Chávez.
  Title: Julio César Chávez
  Passage: Julio César Chávez González (] ; born July 12, 1962), also known as Julio César Chávez Sr., is a Mexican former professional boxer who competed from 1980 to 2005.  He is considered by acclamation as the greatest Mexican boxer of all time, and one of the greatest boxers of all time.
citations: Omar Chávez Julio César Chávez Jr.