Shocking Twist: Rob McElhenney & Kaitlin Olson’s Kids Make a Surprise Comeback on It’s Always Sunny After 13 Years

Thirteen years later, another one of Rob McElhenney and Kaitlin Olson's children made a return on It's Always Sunny in Philadelphia. Each season of the show has a tradition of featuring a diverse range of guest stars, such as Sean William Scott as Country Mac or Jason Sudeikis as Schmitty, and season 16 is no exception. However, the series goes beyond relying solely on big-name celebrities for cameos.

At times, It's Always Sunny in Philadelphia incorporates individuals who have personal connections with the cast and crew. A prime example of this is Chloe Chet DeVito, the daughter of Danny DeVito, who appeared in two episodes. Additionally, McElhenney and Olson, who tied the knot in 2008, have made space for their own family members in the show.

Rob McElhenney & Kaitlin Olson’s Son Leo Has A Cameo In It's Always Sunny Season 16

Leo Grey McElhenney makes an appearance in

Leo Isn't Rob McElhenney & Kaitlin Olson’s Only Kid Who Appeared In It's Always Sunny

, season 16, episode 6 titled "Risk E. Rat's Pizza & Amusement Center." This particular episode revolves around a fictionalized version of Chuck E. Cheese. In the storyline, the gang revisits their cherished childhood restaurant but becomes needlessly irritated upon discovering the multitude of safety measures in place. During their visit, Dee takes Frank on a scavenger hunt within the establishment. It is during this adventure that Frank encounters a child known as "Water Fountain Kid," portrayed by Leo McElhenney. Given the nature of the location being primarily for children, the young character understandably questions Frank's presence.

McElhenney and Olson's children have had their share of appearances on It's Always Sunny in Philadelphia. Their first-born, Axel McElhenney, even played a role in season 6 episode 12, "Dee Gives Birth." The season itself revolved around Axel's character, who remained unseen as a baby. This isn't unusual for the show, as several seasons feature interconnected storylines. For instance, in season 15, Charlie embarks on a quest to find his father, while in season 6, the identity of Dee's baby's father remains a mystery. It isn't until the final episode of the season that the baby is finally seen, portrayed by none other than Axel McElhenney.

McElhenney and Olson's son being cast as the baby in It's Always Sunny in Philadelphia reinforces the show's signature dark humor. In the series, Olson's character is reluctantly forced to give up the baby as she served as a surrogate for Carmen and Nick. The humor continues in the episode as the gang attempts to identify the real father, with McElhenney's character, Mac, initially showing no interest in the child until he envisions it as a comedic Three Men and a Baby scenario. The decision to use McElhenney and Olson's actual son for the reveal in the season finale adds an intriguing touch to the conclusion of the storyline.