Tywin knew that the day would come where he had to join his house with the Starks. There would be a day that King Robert and Ned would be gone and the Lannisters needed to secure an alliance so that in generations that followed the North would continue to be loyal to the throne and Joffrey. That's where Robb Stark and Josslyn Lannister come in. Their marriage will insure the Lannisters remain in power. Josslyn is the youngest of the four Lannister children and possibly the kindest. This is her journey of making her way through the Game of Thrones.