Jungian, having been a victim myself of this attrocity, I suggest that you step in to protect your granddaughters IMMEDIATELY! YOU and the mother have enough proof of what is going on. STOP IT NOW!!

If I was you, if you haven't already, I'd help my daughter pack the necessities for that monster and put them outside the house then have the locks changed. Those babies are going to have a most difficult time already. No more!