It's hard to tell how far this implication reaches beyond the walls of the family's home, but I've got some ideas:
1) The husband is being toyed with by a childish god. His life is like The Truman Show meets Team America. If this is the case, if this unseen god is messing with this guy for its own amusement, it's doing a shitty job of it. The husband seems happy. He cares for his puppet wife and son. When doubt of his love creeps in after he complains about the "ugly wires" of the receiver box, he quells their fears as a loving father would. When his human friend seems put off by his puppet wife, he defends her:
He's a great guy who doesn't seem to be aware that he's ruining a petulant god's fun time.
2) We're seeing a world long after everyone has gotten over the fact that a huge segment of the population had been taken over and controlled by an unseen master. They don't even question it. It just is (although some are just as uncomfortable around people who are different in this world as they are in ours). The guy's friend is put off by the presence of the marionette wife. Some still aren't used to it, and maybe harbor some hatred toward wired folk.
I like the second option, because it implies that the wired folk can potentially have their strings cut, revert back to their human form, and regain their free will. But it also implies that when the puppet wife dances to sexually entice her husband ...
... she's being forced to do that, just as she's been forced to have sex with him for years and bear his child.
"Kill ... me ..."