They reveal Magento isn't their father in the Marvel event Avengers & X-Men: AXIS.
They explore and reveal more of their parentage and origins of their powers in Uncanny Avengers Vol. 2 By Remender & Acuna.
This is how you know whose parents are who or who is related to who is just fan preference.
For over a decade they weren't Magneto's children. They clearly knew who their parents were and then it got retconned for Magneto to be their dad in an even more convoluted story. When initially Stan always intended differently.
So for me why Marvel changed it back now doesn't even matter.
I understand but at the same time they've been Magneto's children longer than they weren't.
Growing up on X-MEN TAS and then watching X-MEN Evolution and Wolverine and the X-MEN they were always Magneto's children. There was no reason to change it except just to mess with FOX.
It may not matter why Marvel changed their parentage again to some, but they definitely did do it to spite FOX. To make their version of SW and QS more in line with the MCU since they can't use Magneto or mutants.
But it's all good. It will never change for me
I legit do not remember Quicksilver or Scarlet Witch even being in X-Men TAS. I grew up on that and maybe Quicksilver may have showed up but he wasn't in the Brotherhood on that cartoon or an Acolyte when Magneto took Asteroid M out to space. The other cartoons I never quite cared for.
That's the main thing I'm hinting on, the twins were in the Brotherhood in the comics for a quick stint and then reformed and joined the Avengers and then went on to be Avengers for decades and rarely went back to X-Men comics even when the X-Men got popular. The main connection then became strictly cuz of being related and even then there wasn't a whole lot of stories.
There's more stuff with Quicksilver and the Inhumans than there is with mutants.
As for just messing with Fox, I think it was more reclaiming their characters in the comics for stories they can use going forward. Marvel really isn't in the business of providing anymore source material for Fox given how little there already is with QS and SW interacting with the X-Men.
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If what ya'll say is true, then Fox kicked Marvel harder in the balls.
Quickslowver casually moves dozens of people out from in front of a moving train but can't move a 5'10 man and a kid out of the way of a couple bullets without getting shot? He earned that L in AoU
Pretty sure QS was killed on purpose. They didn't care about feats or if his death made sense.
They just murked him cuz Whedon needed a death that would stick in AOU to up the stakes going forward.
Or maybe after realizing both studios were gonna use the characters they decided one would get SW and the other would get QS. I mean if Fox kicked Marvel in the balls harder with QS they also completely banged their own balls on a railing with SW. They're suppose to be twins but they make Wanda a toddler in DofP for no explained reason and so far in Apocalypse which is in the 80s like 10 years later there is no signs she's in that movie either.