Kathy Potter, daughter of a Marauder

Harry had an elder sister. This is her story, from her first year at Hogwarts same year as the Twins and Lee Jordan . Its still in-progress so who knows what will happen, but I will try to keep it as close to Cannon as possible, with a few exceptions. Rating due to some strong language in later chapters, but within what teenagers will hear and use daily at school in the UK