Sorry for getting back to your thread a bit late. I'm not sure I can be of much help as I don't know the details of your family dynamics yet, but I just wanted to mention that sometimes, abusers hold very idealized images of their own abusers/abuse, and will go great lengths to maintain them. I would take what's been said about your mother's relationship with her father with a pinch of salt. I wish you luck in finding more information.
Husky My Story
"Our chief want is someone who will inspire us to be what we know we could be." - Ralph Waldo Emerson