Heartwarming / Stuart Little

• When we first meet Stuart, he's a sweet mouse who has nothing but genuine compliments about the other orphans which he's more than happy to share with the Littles when they express how they're looking to adopt a child. It's that infallible kindness and optimism that leads the Littles into choosing Stuart as their son.
• After ignoring his new brother for a few days, George finally starts bonding with Stuart and they work together to finish George’s boat. Later, during the race, George defends Stuart when Anton calls Stuart a stupid mouse/stupid rat.
• Reginald and Camille Stout, the two mice pretending to be Stuart's real parents, are genuinely remorseful when they're told to bring Stuart to the alley cats, to the point where Camille breaks down in tears because of it. When they tell him the truth, he seems angry at first, right before he tells them that this is wonderful news.
  Stuart: That's why I've been feeling so sad. That's why I keep thinking of them. I'm not a Stout, I'm a Little. I'm Stuart Little! I'm Stuart Little!
  • Reginald then grabs Stuart, and sternly tells him that the alley cats want him dead, and they've been told to hand him over. He and Camille were coerced and threatened into doing this, so they would have every reason to hand Stuart over to save themselves. Instead:
    Reginald: As your fake father... I order you to run!
  • Despite lying to him and taking him away from the Littles, Stuart doesn't hold anything against the Stouts and leaves on good terms with them.
    Stuart: Bye, fake father! Bye, fake mother!
    Camille: Goodbye, fake son!
    Reginald: Goodbye, Stuart!
    Camille: (as Stuart drives away) I'm gonna miss that boy.
    Reginald: I'm gonna miss that car.
• Once it's revealed that the Stouts aren't Stuart's real parents, George manages to get the rest of the Littles to help create missing person fliers.
• In the first movie Snowbell starts out very antagonistic toward Stuart, even going so far as to align himself with some alley cats in an attempt to assassinate him! However, once he's cornered the kid his proves to be a Jerk with a Heart of Gold. When both are cornered by the alley cats, he ultimately refuse to eat Stuart — or to let the rest of them do it... even if he tries to hide it.
  Stuart: Snowbell... you saved me?
  Snowbell: Now let's get one thing straight — I'm doing this for the Littles. They love you. George loves you. They're all miserable without you.
  Stuart: But Snowbell, what about what you said—
  Snowbell: I know what I said! I—I Lied, okay? Welcome to Manhattan. I'm the one that hates you.
  Stuart: Aw, Snowbell, you do care! (Hugs his leg)
  • Despite Snowbell's horrible lie about the Little family not wanting Stuart around anymore, the way Snowbell said that watching Stuart leave was killing him, he said it in insincere sarcasm and his smile looks very forced. If you listen closely when he says "This is... killing me", the tone of his voice implies that he does feel awful about lying to Stuart after seeing the mouse in tears and sending alley cats to eat him for dinner. Snowbell does try to talk Monty and the other out of it, but they refuse to budge on the matter of eating him.
• Stuart's speech in the scene where he meets the rest of the Little family in the first movie, where he talks about how he, and the other children back at the orphanage, would talk about one day finally having a family, and how now he finally gets his wish.
  Stuart: Because now I know, fairy-tales are real.
• The fact that even after what happened in the first movie, Snowbell and Monty are still good friends in the sequels (though Snowbell still insisting he can’t eat Stuart).
• George finally accepts Stuart as his brother when he wins the boat race.
  Woman: Who is that mouse anyway?
  George: That's no mouse, that's my brother.