Okay Granger, you can do this. "Mum, I know you are still having to adjust to Narcissa in my life, so I'm going to be polite about this. This situation isn't her fault any more than mine, and she's not a bad woman. Yes, I did some horrible things over the past year while you were away; nicked food, broke into a bank, and killed people. I couldn't even do any Dark Magic because I've always tried to be a good person. It nearly killed me and my friends when we needed a quick getaway.