Question: are wanda and pietro twins?
Answer: Scarlet Witch (aka Wanda Maximoff) and Quicksilver (aka Pietro Maximoff) are the twin children of Magneto (yes, the same Magneto portrayed by Ian McKellen and Michael Fassbender in the 'X-Men' films -- though, to be clear, the 'Avengers' movies are completely separate from 'X-Men').