Granted, I am not certain what that makes you. [ is she teasing him? only a little. sansa could possess a wicked bent when she wanted to -- and could tease mercilessly when she felt safe to do so. ]

Lady Crusher is undeniably maternal. And I suppose because Sokka is our captain, he ought to be the head the family. [ but she laughs, clearly having trouble imagining him as fatherly. ] Mayhaps you are a brother, ser.