#grandparent  a parent of your father or mother
  supertype:  forebear__forbear  a person from whom you are descended
  subtype:  grandfather__gramps__granddad__grandad__granddaddy__grandpa  the father of your father or mother
  subtype:  grandma__grandmother__granny__grannie__gran  the mother of your father or mother
     subtype:  nan.grandma  (British) your grandmother

No statement uses or specializes grandparent; click here to add one.