How did Paul get the money in rocking horse winner?

In D. H. Lawrence's short story "The Rocking-Horse Winner," Paul does not actually get any money. His wealthy family is quite affluent and lives a life of luxury, without any apparent financial struggles.

Paul's obsession with horse racing and his compulsive need to win stem from his emotional distress and the desire to please his mother, who is emotionally distant and preoccupied with maintaining her social status and appearances.