Final answer:
Jethro is addressing Uncle Jed.
Step-by-step explanation:
In the statement, "Yessir, Uncle Jed", Jethro is addressing Jed. The use of the term "Uncle Jed" indicates that Jethro is speaking to someone he considers as his uncle. Other options like Percy, Granny, and Elly are not mentioned in the statement and therefore can be eliminated as possible answers.