Celebrities 12 Unknown Siblings From Extremely Famous Families  

Carly Silver
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Hollywood is full of celeb brothers and sisters, but not everyone can be famous. There are tons of non-famous people with famous siblings who pop up now and then on celeb gossip sites. For example, did you know that pop powerhouses Britney and Jamie-Lynn Spears aren't the only scions of the Spears dynasty? In fact, their oldest sibling is Bryan, who's produced for both his siblings.

And then there's Braison Cyrus, the brother of pop star Miley Cyrus. He doesn't seem likely to remain one of the unknown siblings of well-known siblings, as he's gaining fame as a model and singer. As far as unknown brothers of stars, don't miss Andrew Wilson, sibling of funnymen Luke and Owen. And then there are the unknown sisters of stars - have you heard of Alana Hadid? She's a stylist and the older half-sister of models Bella and Gigi Hadid.

Whether they're the black sheep of their families or rising stars themselves, these unknown siblings of celebrities have names worth knowing.

Tom Franco

Tom Franco is listed (or ranked) 1 on the list 12 Unknown Siblings From Extremely Famous Families
Photo:  Cindy Lynch/Wikimedia Commons/CC BY-SA 4.0

The brother of savant-academic-actor James and baby-faced hunk Dave, Tom Franco is the lesser-known, but equally-talented, third Franco brother. Dave quipped:

"For people who have met all three of us, Tom Franco is the unanimous favorite Franco. He’s the best one - the best-looking, the sweetest, the nicest, greatest guy to be around. We keep him to ourselves. He’s our little secret."

A California-based artist, Tom seems to be juggling multiple artistic ventures at any given time. He renovates lofts, paints murals, and helps run a Berkeley-based nonprofit artists' collective.

Luke Hemsworth is listed (or ranked) 2 on the list 12 Unknown Siblings From Extremely Famous Families
Photo: Mingle MediaTV/Wikimedia Commons/CC BY-SA 2.0

You know Hunger Games star Liam Hemsworth and Thor actor Chris Hemsworth, but have you met their equally hot brother, Luke? The eldest Hemsworth brother is also an actor, and although you might not know his name yet, he's working his way up the Hollywood ladder. He stars in HBO's hit sci-fi drama Westworld and is taking on the role of Wild Bill Hickok in Hickok.

Age: 36

Birthplace: Melbourne, Australia

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Trent Olsen is listed (or ranked) 3 on the list 12 Unknown Siblings From Extremely Famous Families
Photo: HELP the 11th/via YouTube

Mary Kate and Ashley Olsen have been twin titans since they were barely out of diapers, and their little sister Elizabeth joined them in the spotlight. But there's also an Olsen brother, whom the adorable twin toddlers tried to sell for fifty cents in this magical piece of '90s footage.

Later in life, Trent pursued a career behind the screen. Along with Elizabeth, he's the namesake for the Olsens' fashion line Elizabeth and James (James is actually his first name). A graduate of the University of Southern California, he works in movie production and writes comic books.

Age: 33

Birthplace: Sherman Oaks, Los Angeles, California, United States of America

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Bryan Spears

Bryan Spears is listed (or ranked) 4 on the list 12 Unknown Siblings From Extremely Famous Families
Photo: @britneyspears/via Twitter

Britney is without a doubt the most famous of the Spears siblings, though Jamie-Lynn has made a name for herself as a Nickelodeon star and mom. But what about their big bro Bryan? Throughout the years, Bryan has collaborated with his sisters on various projects, and produced Jamie-Lynn's show Zoey 101. He also started a family of his own, marrying Jamie-Lynn's manager, Graciella Sanchez, in 2008; the pair has a daughter, Lexie.

Age: 40

Birthplace: Kentwood, Louisiana, United States of America