In "The Great Gatsby, why doesn't Gatsby get the money that Dan Cody left for him?

In the novel The Great Gatsby, by F.
Scott Fitzgerald, we read about the American dream in the 1920's.  The main character
was Jay Gatsby and the main topic of the narration by Nick Carraway.  It is through Nick
that the reader learns of Jay's involvement with the eccentric, Dan Cody.  Dan liked
Gatsby's energy and eagerness to learn.  He trained Jay and took him places that Gatsby
would never have gone. 

"Gatsby spots the moored yacht of
Dan Cody. In an action that changes the young boy's life, Cody welcomes him aboard his
yacht and introduces him to fine living. Gatsby becomes the protege of the wealthy gold
miner and lives with him until Cody dies."

Gatsby doesn't
receive the Cody fortune because his Cody's family swoops in and takes the money. This
story is recounted in chapter 8 of the novel.  Nick is home from the city and has seen
the accident scene.  He goes to Gatsby to encourage him to leave town but instead Gatsby
insists on protecting Daisy and it is at this point in the novel that Gatsby shares the
story of Dan Cody.