Question: Who is Diosdado Macapagal Arroyo's maternal grandfather?
Sentence (from "Diosdado Macapagal Arroyo"): Diosdado Ignacio "Dio" Macapagal Arroyo (born September 4, 1974) is the son of former Philippine President Gloria Macapagal-Arroyo.
Relevant evidence: Yes