The simple predicate is "are interested".
Greg shows himself to be a dynamic character in this passage.
Explanation:
Greg shows himself to be a dynamic character as he changes and learns the worthy moral over the changes he had seen. He comes to view that a particular person should not be valued over their looks.
According to Lemon Brown, Greg is very caring and Brave person as he lost his son in the war. These all incidences changes the view in thinking of Greg towards his father.
