Rabid Grannies

Suggestions:

Mary Shelley\s Frankenstein Monster of Frankenstein In Search of the Real Frankenstein The Curse of Frankenstein Frankenstein: Italian Style

A large family gathers in the country side for their two Grannies birthday. It's too bad one of the gifts happens to be from their devil-worshipping nephew, and upon opening it, the two loveable grannies turn into rabid, flesh-eating monsters.