out of those in the band, Nick is the youngest
but there is a younger brothers that is NOT in the band named Frankie
Nick Jonas
If you mean in the Band then Nick, but out of the whole family it is Frankie.
REAL ANSWER!
nick Jonas is the yongest Jonas brother a awsome hot band
Nick Jonas is the youngest singer
the jonas brothers are real brothers
"Sons of Jonas", but Kevin came up with "Jonas Brothers".
well there last name is Jonas and they are brothers
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Because their last name is Jonas and they are Brothers. That makes the Jonas Brothers.
Jonas brothers twitter address is www.twitter.com/Jonas Brothers
Because the musical group consists of Kevin, Joe, and Nick Jonas, and they are brothers. It was a convinient name to use; they thought of The Jonas Trio; Jonas 3; and Sons Of Jonas; but the Jonas Brothers was the most reasonable.