[He waves a hand dismissively. He's not starving, and he's actually pretty good at keeping up with his diet. When he isn't, someone else in the household is. While the crystal thing did affect his appetite, it's mostly because he's slept through meals, rather than skipping or forgetting them.]

Remember how I said earlier to lead with the fact that it can grow back? Well, think about leading with that this time around. Or at least not letting them panic about it before you explain.

[The fact that it was bitten off is cause enough to worry, especially when it has her unbalanced and no doubt having other issues she hasn't disclosed in full yet. The concern about it being a permanent disability would just be temporary and additional unpleasantness when they already have plenty to be upset about.]

And yeah, I'd leave Hades out of it. You could just be vague about how long it might take, since it's not all that relevant.