There are the children, especially Cathy who is a central figure. Then there is their mother who plays a crucial role in their situation. And the grandmother also has an important part in the story as she is involved in the family's secrets and the attic situation.
The themes in 'flowers in the attic original story' are complex. There is a strong theme of isolation. The children are cut off from the outside world in the attic. Additionally, there is a theme of betrayal as the mother's actions towards her children can be seen as a form of betrayal. And the theme of coming - of - age is also present as the children grow and change during their time in the attic.