An old one but its where a little boy and a little girl (Siblings) are sent to live at this old woman's house I think and the old woman is cruel to them and feeds them poisoned cookies with white stuff on top? Like frosted oatmeal cookies and then she lives in a huge house and someone tries to get them I am assuming a man and he and the old woman fight? I can't remember its old like 1980+

I believe its flowers in the attic

There is two boys and two girls they have no chose but to go to the Grandmothers(MOMS MOM) to live