Trivia: The saddle worn by Seabiscuit for some of his races is, in fact, the same saddle worn by Phar Lap, who was Australia's, if not the world's, greatest racehorse ever. Billy Elliot, who rode Phar Lap to victory in the Agua Caliente (the world's richest horserace at the time), gave the saddle to George Woolf after Phar Lap died (under mysterious circumstances) in California.
Trivia: Many of the close-ups in the movie were filmed with mechanical horses attached to the truck with the camera so that the background would look right when you see the actors going by trees.
Trivia: The jockey at the crude outdoor race track that Pollard watches as a kid is wearing the same clothes he wears later on in the movie.
Trivia: The Pimlico race track shown in this movie was not really Pimlico at all. The track the producers chose to represent what Pimlico looked like in those days was far from Baltimore, Maryland. It was the Keeneland race track in Lexington, Kentucky.
Trivia: The races had to be re-shot numerous times because the horse playing Seabiscuit constantly lost them.
Trivia: When Sea Biscuit breaks the track record for Tanfran Race track during his workout, it is actually Saratoga with a fake Tanfran sign added.
Trivia: Charles Howard (Seabiscuit's owner) married second wife Marcela Zabala Howard. Marcela's sister, Anita Zabala, was already married to Lindsey Howard, Charles' son. Though the movie never mentions it, Charles Howard actually had three sons from his first marriage not just the one who died (who was not as young as depicted in the movie).
Answer: They probably do, it just isn't shown. Alternatively, they could have died in-between the time we see the young Red and Tobey Maguire. That could be a contributor to all his anger and rage.