This is our attempt to show up every piece of bad fanfiction we have ever read.
As the HPverse Turns
Chapter One: The Potter Family Tree
The founder of the Potter clan was Lord Voldemort himself. His name used to be Tom Riddle, but that made him think too much. Since he was a Slytherin and not a Ravenclaw, he considered this bad. As he had a certain fondness for pottery, he decided to change his name to Potter.
When Tom grew up, he met and married Morgan le Fay. Why? Because she was there. Thus, he became related to every Pureblood family in existence. They had two children, twin boys named James and Severus. They decided that two children were too much work, so they kept the firstborn and sent Severus away.
When James grew up, he was sent to Hogwarts. There he met a girl by the name of Lily Evans. Lily was the daughter of the Squib lovechild of Albus Dumbledore and Minerva McGonagall. James and Lily got married.
A few years later, Lily had a child. But, the father was not her husband. Young Harry was in fact the son of Severus, James's long lost and unknown twin brother. Because of the relationship, the child looked enough like his supposed father that no one ever commented. Thus James died without ever learning the truth.
And that was how Harry Potter, the Boy Who Lived, came into being.
TBC