We will tell him that we're following a possible lead, yes. It's a fine line between not raising someone's hopes overly much and keeping them entirely in the dark, but I think it'd be good for him to have a bit of hard evidence that we are making an active effort to look for her.

And I'll talk to him about visiting Grimmauld. I'll let you know what he says. Just remember that this news about his mum might mean he'll want very much to talk to you, or it might mean he needs a bit of time to himself. Regardless, I'll try to see if I can't get you two together at least once before the end of hols.