They usually don’t pick it up. Watch this video of a kid wrapping his head around the concept that the two guys he’s talking to are married…to each other!
Melissa McEwan at Shakesville adds, “Congratulations, kid. You’ve now got a more sophisticated understanding of marriage equality than about a third of the adult populace of the United States.”
She also helpfully provides the transcript, because, you know, even cute kids are hard to understand sometimes:
Text onscreen: Thanksgiving.
[Calen, a little boy, is standing in a bathroom next to a sink, looking up into the camera.]
Calen: A husband’s a boy.
Adult male voice from behind camera: Right.
Calen: A wife is a girl and a husband’s a boy. Then you two are husbands! [He hold up two fingers on both hands.] Wifes are girls; husbands are boys.
Voice from behind camera: Right.
Second adult male voice, from next to camera: That’s right. So, if you’re a boy‚Äî
Calen: You’ll be a husband.
Second Voice: Right.
First Voice: Yeah, we’re both husbands.
Calen: [puts his head in his hand] You’re both husbands?
Second Voice: Is that confusing‚Äî
Calen: You married each other?! That’s funny! [slaps hand to head]
Second Voice: That’s funny, right?
Calen: Yeah. [looks thoughtful] I usually see husbands and wives, but this is the VERY FIRST TIME I saw husbands and husbands! [grins excitedly]
[The two men laugh; Second Voice peers around and grins into camera.]
Calen: So funny.  So that means you LOVE EACH OTHER!
First Voice: Yeah.
Calen: Yeah. Yeah, they’re much alike. You’re much alike. Hey, I’m going to play ping-pong now.
First Voice: Okay.
[Camera follows Calen out into the hallway; he turns back and looks at the two men.]
Calen: You can play if you want to.
Text onscreen: You’re much alike.
Just one more example that shows that, for the Religious Right, their war is long lost. It’s just a matter of time and demographics.
(h/t my friend Reha)