How are you going to relate it back to holes? Maybe if his family gets a new house, he thinks about his awful sleeping conditions from at Camp Green Lake?

That's a great idea! As the character adjusts to life in their new house, they may reflect on the harsh conditions they endured at Camp Green Lake and be grateful for their new comfortable surroundings. They may also realize the importance of hard work and perseverance, as they compare their current situation to the challenges they faced at the camp. The experience at Camp Green Lake may serve as a reminder of the power of resilience and the value of overcoming obstacles, tying back to the theme of holes and the idea that challenges can ultimately lead to personal growth and change.