Anne Rowling died in 1990, she never knew about Harry Potter, or the phenomenal success her daughter was about to enjoy. The death of Joanne Rowling’s mother was to have a profound effect on her writing, in many ways the whole of Harry Potter is one giant attempt to reclaim a childhood.
“I’ve been writing for 6 months before she died. The weird thing is the essential plot didn’t change after my mother died, but everything deepened and darkened […] it seeped into every part of the books. I think in retrospect, now I finished I see just how much it formed everything.”
J.K. Rowling: A Year in a Life