Tiffany Yelnats is Caveman's mom and Stanley Yelnats III's wife When Stanley's dad found a cure for food odour they sold it and then they got money and used it to afford a lawyer and then Caveman got out of Camp Green Lake. Then when Stanley's dad opened the treasure from Stanley Yelnats I everybody gasped then, they gave half of the money to Hector Zeroni and he used the money to hire people to track down his mom and to buy a house next to the Yelnats. In the film she is portrayed by Siobhan Fallon Hogan.