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(set in an AU where Mary and Freddy are both small in their champion form, and Billy doesn't work for Whiz yet.)
Almost everyone knew the marvels. The magical sunny trio, who always seemed joined at the hip. Where one went, the other two were never too far behind.
Of course, with Captain Marvel being the oldest and looking very similar to the other two (Black hair, blue eyes, you get the idea) everyone thought the same thing; “Cap is the father of Mary Marvel and Captain Marvel Jr. Come on, it's even in the name!”
No one, from the public or the superhero community ever brought it up with them, because 'Well, it's obvious!'
..And then the Captain told them they were completely wrong.
/ / /
Superman, while in a casual conversation with the other leaguers, refers to Marvel Jr. As Captain Marvel's son.
Cap, who happened to overhear: “Son? Jr is my older brother.”
[Shocked pause]
GA, gobsmacked: “Why is he called Jr then?”
Cap, a little taken aback by the apparent shock this was to the others: “Well, to be honest, when Jr was coming up with a name, i suggested Jr, because he was smaller than me, and the name stuck.”
GA, still blue screening the fact that Jr was not Cap's son: “Wow.”
GL, waving his hands frantically to accentuate his point: “Are we just gonna pass over the fact Cap just said Jr was older than him?”
Plastic man, jokingly: “Next he's gonna tell us Mary Marvel isn't his daughter either.”
[Cap shoots Plas a look, and before he can speak up, Plastic man continues, his joking tone nowhere to be seen, now in it's place, an almost disbelieving one.]
Plastic man, incredulous: “Oh my God, you are.”
Cap, nodding in agreement: “She's my twin.
[Que various noises of surprise all around the table.]
/ / /
After a few days of Marvel trying to clear up the misunderstanding, it was quite clear a lot of the leaguers simply didn't believe him. Either chalking it up to magic shenanigans or just really doubting he could be younger than Freddy, even though it was so apparent he 'wasn't.'
So, they decided to pull a prank.
With the help of a spell, he aged his Champion form down to the age of his siblings, and dressed up as Mary.
They couldn't wait to see their faces when they saw not one, but two 'Mary Marvels' flying around the watchtower.
After all, they were twins. And what better way to prove it than the classic twin switch-up?
/ / /
Flash, rubbing his eyes before looking again: “I'm not seeing things, am i? Please tell me i've not gone crazy.”
WW, shaking her head: “No. You are seeing things correctly. There's two of our friend present.”
Flash, now a bit worried: “Has Mary been cloned, or is being followed by a doppelganger?”
WW, tilting her head a bit, trying to remember something: “Not that i recall. Maybe you could ask her about it? She doesn't seem concerned about the 'clone'.”
Flash, slapping his forehead in a 'why didn't i do that earlier?' way: “Good idea.”
[Flash goes over to the two Marys (Maries?). When he arrives, one of them beams.]
Billy: “Hi, Flash! How are you doing?”
Flash: “Good! Well, i've been meaning to ask you.. uh, something.”
Mary, grinning: “Well, go ahead.”
Flash, a bit too bluntly: “Why are there two of you?”
Billy, with the most cheerful voice ever: “Mitosis!”
Flash: “Mitosis?!”
Mary, saying this as if it was the most obvious thing: “Why do you think there's only one big Marvel, and the rest of us are small? We separated from the captain recently.”
Billy, holding in a laugh: “But keep it secret, okay? Me and the others trust you to never tell anyone our secret.”
Flash, who is like 'WTF did i just hear': “Uhh.. sure. I won't tell anyone.”
[The two proceed to tell everyone the supposed 'Secret.' Only years later the League would find out it was a prank, when Billy and Mary showed them their civillian forms. They still use the 'Mitosis' as a inside joke when a new member joins the League.]