[Wally bursts out laughing when Hal says they're getting married, and honestly, no one can blame him.] You guys? Really? C'mon, Uncle Hal, if you're trying to mess with me, you can come up with better than 'we're getting married'.

[They kind of deserve this after all their insistence that they weren't going to get married.]

No, really. Turns out, it's really hard to get your child adopted by your partner if you aren't legally married. So, we're getting married.