Quicksilver is the son of the most powerful man on the planet, Magneto, and the heir to his throne. During the most desperate days of the Mutant-Human War, with S.H.I.E.L.D. intercepting all of Magneto's communications, Pietro was used to coordinate attacks and risked his life time and again to deliver crucial information to mutant operatives around the world.
Following Magneto's final victory, Quicksilver was invited to a victory dinner in the capital city of Genosha along with his sisters Wanda and Polaris. It was on this day Magnus revealed he was truly their father and invited them to join him in running the world. They accepted, and the House of M was formed.
Recently, Magnus has urged his son to woo Ororo, the mutant Queen of Kenya. Pietro truly cares for her, but his attempts have been unfruitful up to this point. He remains completely devoted to his father despite Magnus' frequently cold attitude towards him.