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Kearney is 23 years old. He has a father named Kearney, Sr., a mother named Mrs. Zzyzwicz. Although he looks (and sounds) to be around Jimbo or Dolph's age, Kearney has a young son named Kearney, Jr. (it is not known who the mother is), he is the only present Springfield Elementary School student that celebrated the United States Bicentennial (that is, was alive in 1976) and shaves his beard. Strangely, he once needed a fake ID to purchase beer.
Kearney drives a Hyundai Stellar. Skinner tried to take off the H to replace the 'H' logo stolen from Superintendent Chalmers' Honda Accord. Kearney catches him in the act, forcing Skinner to flee. Kearney is also seen driving an orange Volkswagen Beetle
Otto once stated that he and Kearney both went to Springfield Elementary School together, only for Kearney to reply that they are unable to teach him, which is his reason for why he is still in the school despite being 23. Kearney needs glasses but doesn't use them.
Kearney's son looks exactly like him, though younger and sounding like Ralph Wiggum. He was able to overcome his parent's divorce by sleeping in a drawer at night. He is also considered smarter than Kearney, since when he was sitting on Gil's lap when he was dressed up as Santa Claus, he believed he is the real Santa Claus and his son knew immediately he was a fake. Kearney's son seems to be a young child but Kearney says that is speaking "as a teenager and parent of a teenager" although he probably has some other child that he was talking about.
Kearney has been married to an unnamed (and unmentioned) wife. The only details given though were that he had to divorce with her, because Kearney didn't want his parents to find out. Kearney has said that he misses having sex with her, though it also mentioned in one episode that Kearney dated Jimbo's mother.
Kearney, Sr. is Kearney's gruff, rarely seen father who looks almost identical to his son. One time he attacked Homer in Moe's Tavern after Homer tried to get him and the other fathers to stop their sons from bullying Bart. He hit Homer in the head with a pool stick, which left him stunned yet not knocked out (a condition that would have him become a boxer later). The bullies' fathers then left at gunpoint by Moe, who told them that they could not hit Homer unless they had bought at least two drinks.
Kearney's mother is not seen but is said to suffer from clinical depression, for which she is being treated with medication. Kearney's points to the medication as the primary reason behind her recent weight gain. She is either in a mental clinic or jail.
It was revealed that Kearney, Jimbo, and Dolph were bullied by nerds. Bart then taught them that nerds are "all talk and no action" and they learned to "stand up" for themselves. Bart was later caught in the crossfire when his own creation backfired.
Kearney becomes the Vice-Principal of Springfield Elementary (the principal is still Seymour Skinner), however none of his bullying traits are seen. He will also be Lisa's bodyguard when she becomes the USA president, saying his contract gives him three people to kill in each term. he also was a taxi driver.
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 Behind the Laughter