Edwin Carmichael

Edwin Winston Cranstall Louis Xavier Quincy Carmichael, III is the Carmichael's brain trust, and Susie's six-year-old brother. His room is designed from the idea of a wealthy man's library, as he is an avid reader. He's the most quiet one compared to his siblings. Edwin also frequently wears Einstein pajamas. He is extremely intelligent, known for playing computer games and once built a laser with his friends at his birthday party. He's given more of a speaking role in the episode "Tooth or Dare" when he explains to Angelica and Tommy about the mystical tooth fairy. Although Angelica doesn't believe he really got anything or even lost a tooth, she becomes convinced when he shows his missing tooth. Edwin can understand the babies.

Trivia

 * He is the character with the longest name of the series, since he has six names.
 * While his parents and Susie have all made appearances on series, it's currently unknown if Edwin (along with Alyssa and Buster) will appear in the 2021-reboot of it -- so far in the reboot, Susie appears to be an only child, as there haven't been any mentions of her parents having any kids outside of her.
 * The only episode he and his brother Buster appears in All Grown Up is In The Family's Way while they're never mentioned or shown in any other episodes.