Peter Quill was born on Earth, the son of a human mother and an alien father. Plucked from his rural home, he was thrust into a life of roguery and adventure across the stars. Now teamed up with a group called the Guardians of the Galaxy, Peter Quill has been kicking bad guy butts and saving the day under a different moniker: Star-Lord.
The Earthling who would grow up to guard the galaxy was born in Colorado to Meredith Quill, a human, and Jason (AKA J'son of Spartax), the heir to a galactic empire whose ship crashed in the Rocky Mountains. His ship blew a converter as he made his way home from exploring the stars to help his father in a war that had broken out between the Empire and the Ariguan Confederacy. Meredith was the only person who witnessed the crash and she dragged Jason's body from the wreckage, performing CPR before nursing him back to the health.
Despite being the royal heir to a galactic empire, Jason fell in love with this simple human female. After a year, Meredith was pregnant and he was ready to return to his home world, but not wanting to endanger her (or their child) during the interstellar voyage, he reluctantly left her behind, locking her memories of him before departing so as to spare her a terrible heartache. Meredith then married a man named Jake, who nearly killed the newborn Peter after suspecting it was not his child. Luckily, Jake suffered a fatal heart attack before he could snuff out an innocent life. Baby Peter, left outside during the chaos, stared at the stars before his beaten mother found the strength to retrieve him.
Peter was raised solely by his mother and grew up a loner fascinated with science fiction and NASA. When the Spartax-Ariguan War turned in favor of his Empire, Jason sent his uncle, Gareth, to fetch his wife and son. Gareth, having his own machinations for the throne, sent an assassin to Earth to kill Meredith and Peter, though they only succeeded in slaying the former. Peter, having witnessed the brutal event, swore vengeance.