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.
Both of my grandparents are in good health.
My grandparents live in Kyushu.
I went to see my grandparents during the Obon holidays.
I spent summer vacation at my grandparents' house.
He lives with his grandparents.