noun
grandparents
Refers to both paternal and maternal grandparents collectively. For a single grandparent, use 祖父 (grandfather) or 祖母 (grandmother).
夏休みに祖父母の家に遊びに行った。
I went to visit my grandparents' house during summer vacation.
祖父母は二人とも元気です。
Both of my grandparents are in good health.