Grandchild (noun)

1. A child of one's child.
2. A child of one's son or daughter.
3. A descendant in the second generation.

Origin:

Grand + child.

Examples:

1. She adores her grandchild.
2. He is the eldest grandchild of the family.
3. The grandchild was the apple of her grandparent's eye.
4. The grandchild inherited the family's love for music.
5. The grandchild's arrival brought joy to the whole family.