The Golden Palace was, in essence, the palace where King Gedelin and his ancestors had resided, which meant that, according to usual protocols, Prince Dexter and Princess Elizabeth weren't supposed to stay in the Golden Palace for long, except during festivals or family dinners.
According to the previous rules, princes and princesses would receive their own land to live on in the royal territories outside the palace after they reached adulthood, while the younger princes and princesses needed to stay in the Golden Palace for education and supervision, similar to Isabella, who would return to the Golden Palace after weekends away at Saint Nali University.
But, after all, the situation in the Golden Palace had changed. Seeing that King Gedelin IX's health was deteriorating day by day, with no energy to worry about state affairs, let alone the education of princes and princesses.