Time: Modern day
I've got a married mother of two boys who has a history of mental illness. Her aunt thinks the mother isn't fit to raise her children, and has evidence (diary entries, that sort of thing) of her insanity.
Thing is...where from there? When do social services get involved? If the mother was sectioned, what would happen to the kids? Would they be taken to care, or be allowed to stay with the father?
Googled 'mother with mental illness' 'kids in care' 'kids removed from parents' 'process of children being taken to care' and many more.
EDITED: Thanks for your help guys. I have an idea of what will happen now. :D