Connie and Lonnie Rockwaller

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http://kimpossible.wikia.com/wiki/Connie_Rockwaller

Connie is Bonnie 's and Lonnie 's sister. Connie is apparently the smart one out of the three and along with her fellow sister Lonnie (who got the looks in her family), she looks down on her little sister Bonnie. She is seen in the episode " Bonding ", where she humiliates Bonnie in front of Kim.