Ada and Jamie are the main characters along with Mrs. Smith. They are basically another family. They have fun together, learn stuff together, and celebrate stuff together. they all want the best for each other. they all really enjoy their company and love living together. Jamie is Ada's brother. Mrs. Smith is the person who was forced to take in Ada and Jamie, but now she's happy that she did and loves them.
The plane/army base I think is a great symbol. It is right by Mrs. Smith’s house. In the beginning when they first built it, Jamie snuck out and snuck into the base. Then around Christmas Jamie invited the mover and they had a great Christmas with the Smith's. When the war started to get serious Jamie wasn't aloud over there anymore.
They are back with Mrs. Smith and there was a bomb and everything in their town was gone. Borvil the cat was still alive. They were covered in dirt and dust. The Iron Faced Woman (Lady Thorton) started crying. Everybody started crying. Then it ends, everybody is crying, but they are together and that's all that matter.