7. Willie, Jase, Jep and Alan Robertson
Willie, Jase, Jep and Alan Robertson star on Duck Dynasty, along with parents Phil and Kay and their own kids ... of who there are a lot!
8. Zooey and Emily Deschanel
Zooey (New Girl) and Emily Deschanel (Bones) both star on Fox shows!
9. Britney and Jamie Lynn Spears
Britney Spears and little sister Jamie Lynn are the daughters of ... Jamie and Lynn Spears.
10. Miley, Noah and Trace Cyrus
Miley Cyrus' siblings are lesser-known, but still a big part of her life.
11. Ray J and Brandy
Did you know they were brother and sister?
12. Prince, Paris and Blanket Jackson
Michael Jackson's three children - progeny of the most famous member of a very large group of siblings - have become celebrities themselves.
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