[Crossover] I'm the Dumbest One in the Family

The Stark family has two children. Big brother Tony Stark is in charge of looking cool, while little sister Daliana Stark is in charge of being adorable. One day, Daliana meets a man who is twenty centimeters taller than her, and then she never resurfaces. Tony fumes: "What's so great about that guy, besides being half a head taller than me?" I knew that old man wouldn't let me live in peace! Tony Other titles include There's Always Someone Trying to Steal My Sister, The Mind Palace and Artificial Intelligence, Elevator Shoes Save the World, My Godmother Is Ranshir and My Godfather Is Xavier (Huh? What's wrong with this picture?), Uncle Sweetheart, and many more... Notes: 1. Since two stories in the "His Sister" series were written by Fengyu Caihong, Yaoyao has decided to try writing a sweet romance for this one. 2. Thanks to the support of all my friends, the pairing is set: Sherlock. 3. I've seen the movies and know a little about the comic plots too, so things are a bit mixed together. Please forgive any OOC characters and plot holes. 4. This follows the plot of His Captain's Sister, meaning the Captain is Tony's uncle. His Sister series: Tony's Sister