Scarlet Witch's brother Quicksilver and WandaVision, explained

WandaVision is calling back to 2015’s Avengers: Age of Ultron, with mentions of the Scarlet Witch’s late brother, Pietro Maximoff, also known as the speedy superhero Quicksilver. Let’s do a quick recap of Quicksilver, the Marvel Cinematic Universe, and the X-Men.

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What relation is Peter Maximoff of X-Men to Wanda and Pietro Maximoff of the Avengers? - Quora