Unforgettable {a Niall Horan fanfic}

Kaitlin Gallagher lived a normal, teenage life. That is until she finds out about a shocking family twist, she has a half-brother. Now life will never be the same, but that might be a good thing... She joins her family, best friends, and other very welcomed guests on the summer of her life, three months in New York City filled with laughter, joy, tears, and drama, but it will simply be unforgettable.