[Gives a disappointed look and then sighs and slowly nods, although he isn't feeling very reassured.]

...Well, if you see them, can you tell them I'm here?
They look... um.... [fidgets]
My sister is a bit taller than me and really pretty and usually she has some ribbon in her hair
and my brother is this tall [stretches] and usually he looks like this.

[And he tries to give his best impression of mini-Ned.]