Well, if we assume it's based on a true story, then the power dynamics within the family could be a similarity. In 'Flowers in the Attic', there is a clear power structure where the mother has a lot of control over the children. In a real - life situation that inspired it, there might have been a similar unbalanced power relationship. Also, the emotional and psychological abuse that the children endure in the story could potentially be similar to what might have happened in real life. The children's struggle to cope with their situation and their attempts to break free are also likely to be inspired by real - life events if they exist.