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Unknown Hollywood Siblings

Frank Jonas

Famous siblings: The Jonas Brothers

Yes, there is a fourth Jonas brother. Also known as the "Bonus Jonas," little Frankie has a lot to live up to. How would you like to be the only kid in your family who isn't in the hottest boy band in the entire world? —XFINITY Entertainment Staff (Photo by Kevin Winter/Getty Images)

The opinions expressed are solely those of the author and do not necessarily reflect the views of Comcast.

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