The Mellarks' second son was born in District 12. He was never reaped for the Hunger Games. According to Katniss he was often at the Mellark bakery and was 17 or 18 years old, because he could have volunteered in place of Peeta but chose not to.
According to Katniss, he achieved first place in a school wrestling competition. He beat Peeta, who came in second.