"No, he doesn't... he can't... I mean, I know is pretty obvious, that it's uncle Ron, he never notices until someone, usually aunt Hermione, tells him or points it out" said Lily's voice in a hushed whisper, but still loud enough.
"Well, I'm telling you, he knows" said Albus voice firmly, with an air of definite.
"I still think he doesn't, though I have to agree, Rose and Scorpius are pretty obvious in their total, gigantic, precipice–like, crush for each other, however, when you take in consideration that not even them themselves noticed yet, I'm going with Lily on the 'uncle Ron doesn't know'".
Uncle Ron decided to stop listening them and the kids gave up on the argument anyway, but Lily could swear she heard Albus whisper he knows now… with a faint smirk before he turned way.