Book 1: Two siblings are separated (brother and sister). The sister lives in an orphanage. The brother eventually gets a spaceship and names it after a landmark or something related to London. They later find out that they are aliens, and are royalty. The brother and sister both have special powers. I dont remember what exactly but i think it has something related to technology. They also have robot that helps them, and the spaceship has an A.I, it takes place in modern times.

Book 2: A kid try to kill himself and ends up in a hospital to deal with this problem. One of the girls name in the book is Moon. But before he trys to kill himself he calls her and asks her if he had a chance. She says yes. but shes going out with his friend.