In a family of five persons, Reeva is the sister of Abhilash. Vijay is the brother-in-law of Abhilash. Pihu is the daughter of Vijay. Suresh is the father of Reeva. Abhilash is the son of Suresh. How is Suresh related to Pihu.
Based on the given information, the following family tree can be drawn: 
From the family tree diagram, it is clear that Suresh is the grandfather of Pihu. Hence, the correct answer is (C).
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