People are only just realising that Wandavision star Elizabeth Olsen is related to Mary-Kate and Ashley - and they're "mind-blown".
The former child stars, 34, are best known for appearing in the long-running ABC sitcom Full House, starting when they were just six months old.
They starred in a number of TV series and films all the way through their teens before they went on to launch their own fashion label, The Row.
Elizabeth, on the other hand, is one of the twins' younger siblings at 32.
The girls also have a big brother, Trent Olsen, as well as two younger half-siblings, Taylor Olsen and Jake Olsen.
While some famous siblings aren't exactly a surprise - like Chris and Liam Hemsworth - fans who have only just discovered the relation between the trio have taken to Twitter to voice their surprise.
One said: "ELIZABETH OLSEN AND MARY-KATE AND ASHLEY OLSEN ARE SISTERS????????????? How can I be so dumb? I did not even .... what."
Another wrote: "For the longest time I just assumed that Elizabeth Olsen was an Olsen twin bc I never bothered to check their names....."
"People not knowing that Elizabeth Olsen is related to Mary-Kate and Ashley Olsen is blowing my mind," said a third.
Someone else wondered: "Why are there people who didn't know Elizabeth Olsen is Mary Kate & Ash's sister?! Not only is her name the same, but she looks just like them lol?! Do the same people not know Elle And Dakota Fanning are sisters as well?!"
But that's not the only discovery fans were baffled at as one couldn't believe that Elizabeth is younger than the twins.
They wrote: "Wait how is Elizabeth Olsen younger than the twins. Am I stupid and did everyone else know this but me?"
Did you know Elizabeth is related to the twins? Let us know in the comments.
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