I'm so sorry I can't be of any help. Mamma says some cats just bite, it's just the way they are. My uncle Thomas is a biter, but he will actually draw blood. He's always been a biter, and there's not really any chance of him stopping (as he's been like this for about 8 years). He's got his claws, and he also hunts a lot (every night), so it's not like he's taking out any built up agression or hunt instinct on grandmamma and grandpappa. He's well loves and well cared for... but doesn't give much love back!

Good luck, though.