This book is part of the “To the Rescue” series but takes a somewhat other outlook. DrT writes:
James refused to consider allowing Harry to be taken to America should anything happen to both himself and Lily. What might have happened if Lily had gotten him to change his mind? After being raised in America as Henry and Tabithaï¿½s step-son, Harry Potter returns to Britain to attend Hogwarts. His First year will be much the same, yet also very different.
Because Harry is raised in a loving environment he is able to destroy Quirrel/Voldemort at the end of his first year.
The story is rated PG-13
It can be read online at Schnoogle.
I made a PDF out of its 16 chapters.