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Grandparent
Family Connection
Use 'grandparent' to express a lineage or family tie, indicating respect and affection for elder family members. 
Cultural Respect
In many cultures, grandparents are highly respected figures; speaking of them often carries a tone of veneration. 
Maternal or Paternal
Distinguish which side of the family by saying 'maternal grandparents' for your mother's parents or 'paternal grandparents' for your father's. 