/məˈtɜːrnəl ˈɡrændˌfɑːðər/ – Phrase
Definition: ông ngoại.
A more thorough explanation: A “maternal grandfather” refers to the grandfather on one’s mother’s side of the family.
Example: The will left by the deceased explicitly stated that the inheritance would be divided equally among his three children, with the exception of the property bequeathed to his maternal grandfather.