"Mm. It's not exactly another healing session," Arthur said carefully. "It's a bit more of a commitment than that, actually. Given that his parents are dead, the boy is now essentially homeless. After much discussion," he was embellishing a little - he at least assumed there had been much discussion on this subject, "it has been concluded that you would be the most... logical person to take him in. Many of the children are afraid of him, and some of the adults aren't so comfortable themselves, to be quite honest. But we trust that you would be the perfect person to keep an eye on him, particualrly given your... ah... expertise in the area of administering aid, should it be necessary."
Although Francis could've theoretically turned him down, Arthur was trying to make clear from his language that refusal would not be an option. Or, at least, not a particuarly pleasant one.