Do you mean Miss GLaDOS and Mister Wheatley? Did they explain how the town puts us together as families then? I'm your pet here! Although I don't know how anyone could consider a Tachikoma a pet, but I guess it's one of the quirks of this place.

Anyway, it's a pleasure to meet you Miss Kuyou!

[At this, the Tachikoma offers a claw to shake through the window, actually extending the part the graspers are attached to forward on a bar set in the arm.]