If you want to see the bears in The Bear Forest, you can take your parents on a visit to the zoo, Ouwehands Dierenpark in Rhenen. The best time to visit are the months of April to October. In the winter the bears go into hibernation, during which time they can be seen much less frequently.
Please go to the Ouwehands Dierenpark website for information on opening hours, directions to the zoo, ticket prices, etc.