Well, without more context about 'yesterday's children true story', it's difficult to give detailed information. It could potentially be a story that focuses on how children in the past were different from today's children. For example, in terms of education, they might have had different schooling methods. Their family values and the role of children within the family could also be part of the story.
Definitely not a true story. 'Seeds of Yesterday' is a piece of imaginative literature, designed to captivate readers with fictional scenarios and characters that don't exist in reality.