Whether it's falling in love on set or being friends with only other celebrities, celebrities tend to stick together. And no one's closer than family, so it's not too surprising when you find celebrities who follow their parents' or siblings' footsteps into stardom.
But there are also other siblings who, for whatever reason, fly under the radar. Mary Kate and Ashley Olsen have a sister named Elizabeth, and Chris and Liam Hemsworth are brothers. But did you realize there was yet another Olsen, and yet another Hemsworth?
These are the 15 siblings who aren't as famous as their famous brothers and sisters. Chances are, unlike their celeb relatives, you wouldn't recognise them if you passed them on the street.
Chris and Liam get a lot of attention, but they have an older brother named Luke Hemsworth.
The 36-year-old actor is a little shorter than his brothers — Luke is 5'11'' while Liam and Chris are both 6'3''. While he may not be as famous yet, Luke is on his way — he stars on HBO's "Westworld" as head of security, Ashley Stubbs, and in the movie "Hickock."
In addition to Elizabeth, Mary-Kate, and Ashley Olsen, did you know the three have an older brother named Trent Olsen?
Trent is 32-years-old and lives in LA. He’s an actor and a co-writer for the comic "Asylum." You can follow him on Instagram here.
Kate and Pippa are fashion icons, but their 29-year-old brother James Middleton is also stylish.
James ran a cake-making business and is trying to start a company called Boomf that makes marshmallows with edible pictures on them. It might sound silly, but he has reportedly raised£1 million in funding.
Famous brothers Luke and Owen have an older brother named Andrew Wilson.
Like his brothers, 52-year-old Andrew is also an actor, as well as a director. He’s appeared in movies with minor roles, including "Charlie’s Angels," "Zoolander," and "The Royal Tenenbaums."
Britney and Jamie Lynn have an older brother named Bryan Spears.
The 39-year-old is a film and television producer who worked as a manager for his famous sisters as well as a producer on some of their projects, including "Zoey 101" and the reality show "Britney and Kevin: Chaotic."
Aimee Osbourne decided not to appear on her family's reality TV show, "The Osbournes," with Kelly and Jack.
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