How did Stuart Little help the family with a problem?

In E.B. White's "Stuart Little," Stuart helps the Little family by rescuing his older brother, George, when he gets lost during a boat race. Stuart uses his small size and agility to navigate through obstacles, ultimately retrieving George's lost sailboat and bringing it back to him. This act not only showcases Stuart's bravery and resourcefulness but also strengthens the bond within the family, demonstrating that even the smallest members can make a significant impact.