Definitely not. Flowers in the Attic is purely a work of fiction. It doesn't draw from real-life events or people. The story was crafted to entertain and engage readers within a fictional framework.
Similarities between the book 'Flowers in the Attic' and the true story it may be based on include the concept of hidden family situations. In the book, the children are hidden away in the attic, and perhaps in the true story there were aspects of family members being hidden or kept out of sight for various reasons. Also, the element of a strained family relationship is present in both. In the book, the relationships between the mother, children, and grandmother are full of tension and conflict, and this may mirror a similar dynamic in the real - life situation that inspired the story. Another similarity could be the sense of desperation that comes from being in a difficult family situation. In the book, the children are desperate to escape their situation in the attic, and in the true story, those involved might have been desperate to change or get out of their own difficult family circumstances.
Yes, it is said to be based on some true elements. The story contains themes of family secrets and abuse which might have been inspired by real - life situations that the author was aware of.