I think that's the elephant in the room. "Sick and dying" sounds like some incurable illness, so as soon as the kid misses his monthly supply of blood the illness will come back with a vengeance. So basically there are three possible outcomes to this situation:

1. The kid stays a ghoul and is damned to be a child of 7 years forever. A child, mind you, that due to the blood bond is even more attached to his domitor than children normally are to their parents.
2. The kid loses his status as a ghoul and dies in the foreseeable future because of his illness.
3. The...