Kevin Jonas has the most IQ, at least, that is what most websites say.... but it could be nick or joe, but in the movies, i think they want Kevin to look not that smart so that it adds humor
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Rihanna's highest IQ is 117
Joe Jonas
Frankie Nathaniel Jonas, a.k.a. "Bonus Jonas" or "Frank the Tank".
nick Jonas WAS dating miley. not sure if they are now.
Idk if you meant all four of them or the youngest one but I'll just name all Kevin (real name Paul) Joe Nick Frankie