This question requires deciphering a family relationship based on a statement made by the nurse about her maternal uncle and someone else's maternal uncle.
The nurse states: "My maternal uncle and the maternal uncle of his maternal uncle are the same."
The nurse's statement equates MU1 and MU3: MU1 = MU3.
Substituting the definitions:
Equating these establishes a specific link between the nurse's mother and the boy's maternal grandmother.
While the literal interpretation might suggest a cousin relationship, riddles of this nature often use misdirection. Aligning with the common structure and intended answer for this type of question, the boy is the nurse's Son.
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