Can you please take my cat to my cousins for me please?
The narrator.
The passage never gives the narrator a name, or refers to himself in any given name.
The given clause, "whoever wins the contest a savings bond" is a subordinate or a dependent clause. This kind of clause does not convey a complete thought and needs the main sentence in order to make it understandable. This subordinate clause is connected to the main clause with the subordinating conjunction "whoever".