Rose and Ivy Potter
When Harry Potter was four, twins Ivy and Rose Potter were born. He, of course, had no clue he had two baby sisters that were dropped off by a mystery man at a house in Scotland. He had no clue that these twins would grow up being loved, lied to, abused, and have many ups and downs in life. This he knew not of. But he would learn.
JK Rowling has revealed that Lily Potter was pregnant when she died, and the killing curse was for HER, NOT the twins inside of her. What if they survived? They did. But since their mother died before they were born, it took longer for them to grow.
This book follows Ivy and Rose before and during their first few years of Hogwarts. I only own Ivy, Rose, Danny, and a few others, JK owns the rest.