[Reaching for a cup of tea, Rin cradles it before sipping to respond to Alex, and likely showing that symbol she drew on her hand with the motion.]

The magecraft a family practices is their life; the product of generations and generations of hard work. A mage will gladly kill anyone from outside their family to steal another's secrets. Just because we were siblings doesn't mean we can get buddy-buddy. I could try to weasel her family's techniques out of her, or she might try the same.