Although he has plenty of alternate timeline children and even a clone or two, there are three children for whom Magneto is most well known: Wanda, Pietro, and Lorna.
Magnus is the son of Magneto and Rogue. He had the potential to be even more of a "master of magnetism" than his father had been. When he reached his early teens his powers took a frightening turn.
Anya was the daughter of Magento and Magda. After being stifled his full wages, Magneto used his powers to threaten the farmer. The townsfolk thought he was a warlock and beat him to a pulp and burnt down his home, killing his wife and daughter.
However in the 2014 AXIS event the siblings parentage was retconned so that Magneto was not in fact their biological father, and both Wanda and Pietro weren't even mutants at all.
Although he has plenty of alternate timeline children and even a clone or two, there are three children for whom Magneto is most well known: Wanda, Pietro, and Lorna.
Mystique abandons Kurt as well when her true form is revealed during birth and the townspeople turn on her. Later, she raises Rogue as her foster daughter with her longtime partner and lover, Destiny.
How did Quicksilver learn that Magneto was his father? It isn't shown in the movies, but it's very likely his mother told him after Magneto attacked the White House in Days of Future Past. In the comics, Magneto discovers the truth before Wanda and Pietro during The Vision and the Scarlet Witch mini-series.
Once the constantly-evolving Alpha considered Xavier, Magneto, and their dueling philosophies, he turned Magneto into an infant in DEFENDERS (1972) #16 by Len Wein and Sal Buscema. Xavier placed Magneto in the care of Moira MacTaggert, who tried to genetically modify him to be more mentally stable.
Her parents, Owen and Priscilla, were married early in their relationship and lived in a back-to-nature hippie commune in Caldecott County, Mississippi. Born as Anna Marie, she enjoyed the attentions of her Aunt Carrie, on her mother's side.
X-Men '97 revealed that Magneto knew Rogue in the past, and that due to the nature of his electromagnetic powers, he was able to touch Rogue without her absorbing his powers and memories.
Wally is much, much faster than Quicksilver. Quicksilver is generally portrayed to be running at speeds around Mach 10. Flash is on average moving lightspeed. When he pushes himself, he can move up to ten times the speed of light.
Believing Magneto to be responsible, they attacked him and his family in Genosha. There, Layla Miller restored his memory as well, and the heroes realized that Quicksilver had been the one to manipulate Wanda into warping reality. Angry over what his son had done in his name, Magneto lashed out and killed Pietro.
When only Pietro reacted, it was implied that the twins were not in fact biologically related to Magneto. It was subsequently confirmed that they were not Erik and Magda's children and that they were also not mutants, with their powers being attributed to experiments the High Evolutionary performed on them.
In X-Men: Apocalypse, the character takes on a much larger narrative role. Maximoff is revealed to be the son of Erik Lehnsherr / Magneto, who is unaware of this son. Peters stated of the film, "I have learned that he's my father at this point ...
In 1994, it was revealed that Nightcrawler was the son of mutant supervillain Mystique / Raven Darkhölme, and for many years after a 2003 storyline, it was believed that he was born out of her short affair with Azazel.
X-Men '97 continues the classic X-Men: The Animated Series, with Magneto's immunity to Rogue's powers teasing major story developments. Rogue's power absorption struggles explored in X-Men '97, hinting at past connections, potential romance, and a mutant utopia storyline.
This visual aspect of Rogue's appearance has been consistently portrayed in every adaptation of the character, however, in the 2000 X-Men live action film, Rogue is shown to initially have all brown hair, developing the permanent white streak after being forced to absorb a significant amount of power from Magneto.
