Is Kaitlin Olson Related to Mary-Kate? The Truth Behind the Rumor

Kaitlin Olson is a popular American actress and comedian, best known for her roles in the sitcoms *It’s Always Sunny in Philadelphia* and *The Mick*. But is she related to the famous Olsen twins, Mary-Kate and Ashley, who rose to fame as child stars in *Full House* and later became fashion icons? The answer is no. Despite the similarity in their last names, Kaitlin Olson and the Olsen twins have no family connection whatsoever. Here are some facts that prove it.

Different Spelling of Last Name

The most obvious clue that Kaitlin Olson and the Olsen twins are not related is the different spelling of their last name. Kaitlin’s surname ends with “son” while Mary-Kate and Ashley’s surname ends with “sen”. This may seem like a minor difference, but it indicates that they have different origins and ancestry. According to, the surname Olson is derived from a patronymic meaning “son of Ole”, a Scandinavian personal name. The surname Olsen, on the other hand, is derived from a patronymic meaning “son of Ola”, a Norwegian personal name.

Different Parents and Siblings

Another way to confirm that Kaitlin Olson and the Olsen twins are not related is to look at their parents and siblings. Kaitlin was born in Portland, Oregon, to Melinda Lenora and Donald Olson. She has a brother named Will and a sister named Sara. Mary-Kate and Ashley were born in Sherman Oaks, California, to David Olsen and Jarnette Jones. They have an older brother named Trent, a younger sister named Elizabeth (who is also an actress), and two half-siblings named Courtney and Jake from their father’s second marriage.

No Mention of Each Other in Interviews or Social Media

Finally, one can assume that Kaitlin Olson and the Olsen twins are not related because they have never mentioned each other in interviews or social media. If they were cousins or distant relatives, they would probably acknowledge their connection at some point or show some support for each other’s work. However, there is no evidence of any interaction or communication between them. In fact, some people have mistaken Kaitlin for Elizabeth Olsen, the younger sister of Mary-Kate and Ashley, because of their resemblance. However, Kaitlin has clarified that she is not related to the Olsen twins or their sister.


In conclusion, Kaitlin Olson is not related to Mary-Kate or Ashley Olsen. They have different last names, different parents, different siblings, and different careers. They are simply two sets of celebrities who happen to share a similar sounding surname. The rumor that they are related is false and has no basis in reality..

Doms Desk

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