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? She once told INSIDER that it was "really strange" that anyone would want to be famous.
These are the 17 siblings who aren't as famous as their famous brothers and sisters. Chances are, unlike their celeb relatives, you wouldn't recognize them if you passed them on the street.
Penélope Cruz's younger sister is an accomplished dancer and occasional actor.
Mónica Cruz Sánchez followed her older sister's lead into acting, at one point standing in for her in "Pirates of the Caribbean: On Stranger Tides" to hide Penélope's pregnancy.
She also has a successful career in Spanish-language television and movies, and attended the Royal Academy of Dance before working at Joaquín Cortés's flamenco dance company.
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. He also recently had a cameo in his eldest brother's new movie, "Thor: Ragnarok."
In addition to Elizabeth, Mary-Kate, and Ashley Olsen, did you know the three have an older brother named Trent Olsen?
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