What are the initial signs that Gudio is very protective of his son?

Guido and Dora's son. After Guido and Giosue are taken to the concentration camp, Guido convinces Giosue that they are both participants in a giant game and that the winner will receive a real tank. Giosue is occasionally skeptical of his father's fantastic ideas, but he generally takes great joy in the magical world that Guido creates for him.