[Wei Wuxian meets Jake's glare with a knowing smile, nodding subtly in understanding.]

Well, obviously! You didn't think I'd mistake you two for foxes, did you? [It occurs to him belatedly that a dog had glared at him and he didn't even want to cry about it. He really is getting used to Jake. Or maybe it's just the understanding that even if he doesn't know why, he knows Jake's protecting Finn. It's difficult to be upset about that.]

And anyway the family resemblance is clear. I don't see how anyone would ever mistake you for anything but brothers. [And he means it. With the way Jake looks at Finn, it is obvious.]