In Brisingr a book about how Eragon a 15-16 year old became the dragon rider to rebel against Galbatorix. He has to keep keep oaths and has to keep his loyalties as well. He has changed from a 15 year old farmer to a 16 year old dragon rider. He helps his cousin Roran save Roran’s soon to be wife. Eragon also ends up marrying the couple. Eragon loves his cousin and they are brothers but, not blood.