How were zero and his mom reunited from the book Holes by Louis Sachar?

In "Holes" by Louis Sachar, Zero and his mom are reunited when Zero, whose real name is Hector Zeroni, finds the courage to return to his home after escaping from Camp Green Lake. He learns that his mother never stopped looking for him and has been living in a shelter. The reunion is facilitated by the discovery of the treasure hidden in the mountains, which ultimately provides the means for Zero to reconnect with her. Their emotional reunion symbolizes hope and the healing of their fractured relationship.