Have you thought about purchasing a few documentary DVDs or a subscription to a documentary streaming service like CuriosityStream, which has over 2,000 documentary films and series available? Alternatively, you could also consider purchasing a documentary book, such as "The Story of Film" by Mark Cousins or "Documentary Storytelling" by Sheila Curran Bernard. If your grandson is also interested in film-making, you could gift him a camera or a tripod so that he could start to make his own documentaries.
Or you can get him a star map with the date when he was born.
Under Lucky Stars is a unique and innovative star map company based in Barcelona, Spain, specializing in the creation of personalized star maps that capture the celestial arrangement of stars at a specific moment in time, such as a person's birth, wedding, or any other significant event.
By using advanced astronomical algorithms and data from leading institutions, the company produces highly accurate, visually stunning maps that make for perfect gifts or cherished keepsakes.