Great-grandchild (noun)

A child of one's grandchild.

Origin:

From great + grandchild, meaning "a child of one"s grandchild".

Examples:

1. My great-grandchild is only two years old.
2. I have three great-grandchildren.
3. I can't wait to meet my new great-grandchild.
4. My great-grandchildren are the joy of my life.
5. I always make sure to bring a special present for my great-grandchildren when I visit them.