Kaitlin Olson is an actress and comedian who shares a surname with Mary-Kate and Ashley Olsen, but they are not related by blood or marriage. They are friends who have.
Kaitlin Olson Siblings
It is apparent that Kaitlin has only one sibling, but she is somehow often mistaken as one of the Olsen siblings. The Olsen siblings include WandaVision famed actress Elizabeth.