That truth is…um…really, really complicated. There’s stuff involving Mephisto and Franklin Richards and Master Pandemonium, who has the power of baby hands. And not the kind of baby hands that Donald Trump and Teen Titans Go Robin have. I mean that literal babies Billy and Tommy became his hands. It’s wacky.
Wanda did not take this news well and briefly turned villain because of it. It was a whole mess that involved her sexually assaulting Wonder Man. They ended up mindwiping Wanda of the whole incident, including her having kids to begin with. Ah, mindwiping. The superhero trope that never, ever ends well over time. Just ask Dr. Light and Batman.
Vision and Wanda returned to their usual soap opera filler stuff until Brian Michael Bendis decided that he wanted to freshen up the Avengers as a concept. In the big storyline Avengers: Disassembled, Scarlet Witch regained her memories, went a little nutty, and decided to have a whole bunch of stuff go wrong at once by abusing her powers against her so-called teammates. I’m talking alien invasions, She-Hulk losing control of her rage, Ultron attacks, exploding zombies, Tony Stark having a drunken rant at the UN, etc. She was stopped in a very anticlimactic fashion and the Avengers just decided that they were done being a thing.
Wiccan and Speed
A new Avengers team (now with mainstream appeal!) would show up months later and in the meantime, a group of teenagers tried to pick up the slack themselves. A younger version of the time-traveling villain Kang the Conqueror came to the present under the name Iron Lad and put together a team of heroes called the Young Avengers. One of these heroes was Wiccan, a boy named Billy with magical powers and reality warping, which were awakened after a mysterious meeting with Scarlet Witch.
At one point, he came across a troubled teen with speedster powers named Tommy who, despite having different parents, looked exactly like Billy but with white hair (white hair and super speed being part of Wanda’s brother Pietro’s whole deal). Iron Lad explained that not only were the two twins, but they were Wanda’s twins.