Summary
Despite being considered part of the Tanner family, actor Dave Coulier's character Joey Gladstone was never officially referred to as "Uncle Joey" in Full House.
The Mandela effect pertains to the occurrence of multiple individuals having false memories, and the misconception surrounding Joey being addressed as "Uncle Joey" serves as an illustration of this phenomenon. Despite not being a biological relative of the Tanners, Joey played a significant part in their family dynamics and was commonly referred to as "Uncle Joey" by Jesse when speaking to his twin sons.
Actor-comedian Dave Coulier portrayed the character of Joey Gladstone for all eight seasons of Full House. Despite being considered a part of the Tanner family, he was never addressed as "Uncle Joey" as many viewers had assumed. The term "Mandela effect" was coined by paranormal researcher Fiona Broome, and it refers to the phenomenon of a large group of people sharing false memories. There are other instances of this in media, such as the misspelling of the "Berenstein" Bears.
Joey appeared in both Full House and its sequel, Fuller House, and has been misremembered by many as "Uncle Joey" despite evidence to the contrary. Jodie Sweetin and Andrea Barber, who played Stephanie Tanner and Kimmy Gibbler respectively, recently started a podcast where they rewatch episodes of the original series. During one of the podcast episodes, Sweetin clarified the misconception surrounding the "Uncle Joey" Mandela effect.
Full House revolved around the story of a single father raising three young girls with the help of two other men, creating an unorthodox yet loving family. These two men were Uncle Jesse (portrayed by John Stamos) and Joey. While Jesse was a legitimate uncle to the Tanner girls and was referred to as such, Joey was not.
Why Everyone Thinks Full House's Joey Was "Uncle Joey"
Full House was centered around the Tanner family, leading audience members to naturally assume that Joey was an official part of the family, hence being referred to as "Uncle Joey." Danny Tanner served as the head of the household, with Joey and Jesse acting as his right-hand men. The two of them always found themselves involved in mischievous adventures with each other and were equally involved in raising the girls. Therefore, it was understandable for viewers to believe that Joey was their actual uncle. However, it should be noted that Joey was not a blood relative of the Tanners; rather, he was Danny's closest childhood friend.
In Full House, Pam, Danny's wife, tragically passed away before the show's start. Her untimely death, caused by a drunk driver, served as the catalyst for the story and led to Joey and Jesse moving in to provide support for Danny. Joey took the opportunity to move in and assist his best friend in raising his daughters, while Jesse took on the role of helping to raise his nieces, being Pam's younger brother. Despite the absence of a blood relation, Danny and Joey shared a bond as close as brothers, and Joey held a significant role within the Tanner family, even without the girls officially addressing him as "Uncle Joey."
Joey Actually IS Called "Uncle Joey" In Full House
Adding to the Full House "Uncle Joey" Mandela effect, he was given this title in the show, although not by the girls. It is common for close family friends to be considered as actual family members, addressing each other as brother, sister, uncle, aunt, cousin, and so on. Therefore, it comes as no surprise that Jesse referred to his best friend as "Uncle Joey" when speaking to his twin sons. Even though Joey may not have been recognized as "Uncle Joey" by the Tanner girls, Jesse made sure to show his respect for his honorary brother by bestowing him with that title for the Katsopolis boys. Danny also took on the role of "Uncle Danny."