That would be a good idea... if I knew even the first thing about preparing food. [She laughs a little nervously.] I suppose I could practice when she's not home... it would have to be one or the other, though. I don't want to risk giving my poor sister food poisoning on Christmas.

[Such little faith in yourself, Elsa....]

And I don't see why you can't call this person your brother, even if you're not related by blood. There's a whole lot more to family than just that.