The answer is that Manuel is the grandfather of the person asking the question.
The answer to the question is: D) Mi nieto.
In this scenario, Manuel is the grandfather of the person asking the question. The relationship can be traced as follows: If the son of Manuel's son is the father of my son (the person asking), then Manuel is the grandfather of the person. Therefore, Manuel is the grandfather (abuelo) in relation to the person.
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