Oh, well, Obliviating them would be better, so we don't have to go at all, but I guess seeing it so people know we've seen it and then Obliviating it would be more prudent.

If Looney's coming home then we could practise on her. Or - have your parents decided to keep mudbloods in the house? I bet we could practise on one of them, just for little things like whether they'd made the beds or whatever, and they wouldn't get in horrible trouble for forgetting and we'd get our practice in.