Grandkid (noun)

A child of one's child.

Origin:

A combination of the words "grand" and "kid", meaning a child of one"s child.

Examples:

1. My grandkids are the light of my life.
2. I can't wait to play with my grandkids this weekend.
3. I love spoiling my grandkids.
4. I'm so proud of my grandkids and all their accomplishments.
5. Being a grandparent is the best, I get to spend time with my grandkids and give them back to their parents when they get too rowdy.