He is the second child of Katniss Everdeen and Peeta Mellark. He also has an older sister.
Biography
Katniss' pregnancy with her son was easier than her daughter's. He has Peeta's blonde hair and Katniss' grey eyes of the Seam. He is a toddler during the epilogue, and seems to be at least few years younger than his sister. The epilogue also states that he has chubby legs. Katniss probably had him when she was around 36, as eighteen years ago, she was 18, and she had her first child 15 years after that. He does not know of his parents' roles in the Games, as Katniss does not yet want him to know. However, she does recognize that he will be taught as he matures.