This is about Mabel's children in the future. It's fairly long (In my opinion) and post anything you have to say about it in the comments!
Gravity Falls - Rated: T - English - Mystery/Supernatural - Chapters: 1 - Words: 7,865 - Favs: 1 - Published: 6/1/2016 - Dipper P., Mabel P., Bill, Grunkle Ford - Complete