What was the climax in boxcar children book 1?

In the first book of the Boxcar Children series, titled "The Boxcar Children," the climax occurs when the four Alden children, Henry, Jessie, Violet, and Benny, are discovered living in the boxcar by their wealthy grandfather. The children had been abandoned by their parents and had taken up residence in an old boxcar, where they tried to survive on their own. When their grandfather learns about their living situation, he realizes that he has been neglecting his responsibilities and decides to take the children in and provide for them. This revelation and reunion serve as the climax of the book, as it brings about a significant change in the children's lives and brings the story to a turning point.