Family[]
Huey & Louie Duck[]
Huey, Dewey and Louie are triplet brothers with Dewey being the middle sibling (younger than Huey; older than Louie).
Dewey is very close with his brothers. They can be rambunctious at times. Even though they're brothers, Dewey has a close friendship with them. They usually get along, but sometimes they can disagree and get into arguments or competitions. Some cases include when Huey and Louie eventually found out about Dewey secretly researching about their mother's disappearance, and they showed disdain towards him for having kept it from them. Dewey's main reasoning for it was because he didn't want them to find out about something that could upset them, but his brothers believed he was being selfish. Nevertheless, the three made up and promised to work together if such occasions were to ever occur again in the future.
- HUEY DUCK: Huey is Dewey's older triplet brother (by 3 seconds). Whenever Huey starts losing his temper and/or sanity, Dewey is usually the one to calm him down. On the other hand, Huey doesn't appreciate whenever Dewey refuses to communicate with him properly ("Sky Pirates...in the Sky!"; "The Secret(s) of Castle McDuck!").
- LOUIE DUCK: Louie is Dewey's younger triplet brother (by 3 seconds). In general, Louie enjoys tricking Dewey into doing his chores for him ("The Other Bin of Scrooge McDuck!"), assuming he's very susceptible. However, Louie is surprised at how perceptive Dewey can be sometimes. Later on, Louie doesn't trust Dewey when it comes to planning schemes, although he has a change of heart after "Louie's Eleven!".
Donald Duck[]
Donald is Dewey's uncle and guardian.
Donald has been parenting Dewey and his brothers from the beginning since Della wasn't there. Although Dewey views him as boring and overprotective, he still loves his uncle, even though Dewey and his brothers tend to go behind his back. Despite Dewey's rebellious nature, Donald continues to love him unconditionally and do whatever he can to protect them. Which is shown in "Woo-oo!" where Donald jumps into danger to prevent Dewey from becoming burned.
Yet during the events of The Shadow War Dewey learns to respect Donald. Dewey stated a great appreciation for Donald as a devoted and selfless family man, even when Donald finally willing to forgive Scrooge and convince the Dewey and the boys to forgive him to become family again. And when the shadow war starts Donald stands up in taking lead to save Scrooge and stop Magica. Dewey discovered greatness his uncle that he started to quote Donald line " These Ducks don't back down!" throughout the episode. Afterward, Dewey has given Donald a lot more respect and praise when cheering on his fighting skills in other adventures.
Della Duck[]
Della is Dewey's biological mother. He was investigating her disappearance when he first sees her portrait. Since he didn't know much about her growing up, it made him obsessed to know the mystery of her disappearance.
Della's childish recklessness action has affected Dewey, by making feel abandoned that it caused Dewey‘s attention-seeking behavior through several adventures. When discovering more about his mother's amazing adventurous talents, it caused him to behave similarly to his mom leading to dangerous repercussions. Even with his obsession learning what happened to Della lead him to seek her out even in danger like in "The Last Crash of the Sunchaser!".
Dewey met Della's younger self during the past year of Christmas prior to the series, realizing that Della just wishes to spend Christmas with her brother. Although he tried to keep it a secret, Della and Donald knew he was from the future. Dewey finally meets his mother in person in the present day in "Nothing Can Stop Della Duck!" he first mistaking her for a cyborg due to her metal artificial leg. Dewey, having waited for this moment his whole life for a long time, rushed to hug his mother without hesitation. Dewey expresses surprise when his mother's original name for him was Turbo and is the first to embrace her when he finally meets Della for the first time.
They later go on an adventure in the arctic together in "Raiders of the Doomsday Vault!" for the search of the money tree seeds within the Doomsday Vault. Della's constant perseverance into serious danger, however, leads Dewey to realize the real trouble he's putting himself in, and eventually breaks down. But luckily Della helps both of them escape the vault before any more danger could come their way.
Scrooge McDuck[]
Scrooge McDuck is Dewey's great-uncle.
Dewey looks up to Scrooge, viewing him as the most exciting duck in the world. He never knew he was his great uncle before the events of "Woo-oo!", and within learning, they were related, Dewey was ecstatic and wished to impress him.
However, after learning about the events of his mother's past in "The Last Crash of the Sunchaser!," Dewey chose to despise Scrooge and was the first to blame him for what happened. Nevertheless, he and Scrooge reconcile during their battle against Magica De Spell in "The Shadow War!," and he agrees with the rest of the family to move back into the Manor.
Webby Vanderquack[]
Webby is one of Dewey's friends. This is not only because they're kindred spirits with their love for adventures and mystery, but also because they are very reliable, trusting and compassionate towards each other which can describe as a profound friendship.
They are always there for each other when the time is tough and thrilling. This is shown in "Daytrip of Doom!" when everyone was hesitant to bring Webby to "Funzo's Fun-Zone" knowing she is going to be a handful, but Dewey wants to give her a chance and help her out.
In "The Great Dime Chase!" when Dewey wishes to know about his mother, he turns to Webby for help. Throughout all the trails, they discover a secret room dedicated to Della. Dewey trusts Webby to keep this as their secret until they know what it means. With all the trust and kindness Dewey gives Webby in their friendship, she does the same.
In "The Spear of Selene!", Dewey wishes to quit their conspiracy hunt on Della Duck. Webby doesn't want to end her investigation, so they have a small fight about it. Yet, once she found out that Dewey is scared to know his mother's true nature, she shows her sympathy by stepping aside in support of her friend's emotional strife. However, this motivates Dewey to keep going. He thanks Webby by saying that he is grateful to have her around. Dewey even shows his sensitive and anxious part of himself, showing an open-honesty between them.
In "The Most Dangerous Game...Night!" all of their time together has them believing that they are the perfect team, as they love working together to get past danger and even sing in harmony. But, as they have trouble being in sync, it makes them doubt one another being a perfect team or even friends. But Scrooge tells them that their bond goes beyond friendship, to them actually being family.
Their longing for solving mysteries together is shown in "What Ever Happened to Donald Duck?!" when they realized that Huey's postcard to Donald was returned, which led them on a quest to figure out what went wrong. Unfortunately, they took a wrong turn and instead learned about Donald's therapist Jones and the source of Donald's anger. In the episode The Last Adventure! after Ludwig Von Drake revealed that Webby was in fact Scrooge's daughter this make Dewey, Webby's cousin
Friends[]
Launchpad McQuack[]
Out of the triplets, Dewey is the closest to Launchpad - in fact, they consider themselves as best friends, and Launchpad occasionally refers to Huey and Louie as "Dewey's brothers". In "Terror of the Terra-firmians!", Launchpad is worried that Dewey might be possessed by a mole-monster or is in trouble.
In "Beware the B.U.D.D.Y. System!", the two of them hang out together. Launchpad introduces Dewey to his favourite TV show, Darkwing Duck. Launchpad also asks fashion advice from Dewey. In "Jaw$!", when Dewey gets eaten by Tiffany, Launchpad wakes up in the middle of the night because he senses his best friend is in danger and takes Donald's Houseboat to the Money Bin to rescue Dewey.
Fenton Crackshell-Cabrera[]
Dewey is one of the people who know that Fenton is Gizmoduck.
Gosalyn Waddlemeyer[]
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She and Dewey are good friends. They do not have any interactions in the show other than in Let's Get Dangerous! where Dewey helped her to find out more about what happened to her grandfather.