Charlie discussed it with his father and great-great-aunt Muriel and both told him that he was able to abdicate his title as heir Prewett to his younger brother, Percy. When he had seen Percy's grades in basically every subject, he had to admit that Percy had the better skills in politics than him. So, he discussed with Percy that Charlie wanted to pass the heirship to him since he didn't like politics. At first, Percy wasn't sure, but later Charlie was able to convince him that Percy had a better understanding towards politics than him.