Pietro (sometimes referred as Peter) Maximoff was raised by the gypsy couple Django and Marya Maximoff along with his twin sister Wanda (aka Scarlet With). The gypsy couple was poor and Django turned to stealing in order to feed his family. Pietro used his incredible speed, which he discovered as a teenager, to run away with his sister Wanda. They lived in Europe until one day Wanda set a house on fire–whoops–and they were rescued by Magneto.
They didn’t want to aid him but they felt they owed him a debt. Once Magneto was… off planet (guess you’ll need to read some comics folks), Quicksilver convinced his sister to join the Avengers, who were seeking new members. They fought alongside Captain America and Hawkeye.
Quicksilver had a falling out when his sister began a relationship with Vision (whom she later married). The rift was only mended after Moondrop altered Quicksilver’s hatred.
After they were abducted by their foster father, Quicksilver and Scarlet Witch took a leave of absence to investigate their origins. When they arrived at Wundagore Mountain they met with Bova and learned that Magneto was their father.
All of the X-men have a special place in my heart. They are a representation of the idea that what makes us different is also what makes us unique and our talents and preferences should be fostered and appreciated–not feared. To me, Quicksilver’s story is also a message to those who come from bad homes. It is essentially the sins of the father are not the sins of the son. I think a lot of people hold on to their parents’ failings and believe it is a cause for them to repeat mistakes. I think Quicksilver’s history is proof that people can change and have the power to not continue in their parents’ footsteps. Some people need to hear that.