Phillip
When Phillip hears a plane and says "we'll be rescued," he doesn't realize that the plane isn't a rescue plane. Instead, it is a warplane - potentially from Japan.
Phillip's Blindness
Only after going blind, Phillip is finally able to see Timothy correctly.
Phillip's Father
Phillip's father tells Phillip "Well, you can rest easy, Phillip. The Germans would never waste a torpedo on this old tub." Shortly thereafter, however, the "old tub" was hit by a torpedo.
Phillip and Timothy
Despite their issues (Phillip's age and then, after a period of time, his blindness and Timothy's blindness), both Phillip and Timothy manage to survive for quite a while on the Cay.
Phillip and Timothy's Friendship
Despite their many differences, Phillip and Timothy kindle a deep and meaningful friendship with each other.