Introducing a boy to a gathering, a woman said, "He is the only son of my maternal grandfather's only child."
How is the boy related to the women?
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→ M a t e r n a l G r a n d f a t h e r ↑ ↓ Only child ↑ M o t h e r − son ↑ ↓ brother ↓ ↑ ⟵ w o m a n ⟶ ⟶ b o y