What is what do you call your cousins child?

Your cousin's child is your first cousin once removed.

Here's the breakdown:

• "First cousin" refers to someone who shares a grandparent with you. Your cousin's parents are siblings to one of your parents, which means you and your cousin share grandparents. If you want to learn more about "First%20cousin" you can visit this url: First cousin.
• "Once removed" indicates a difference of one generation. Because your cousin's child is one generation younger than your cousin (and thus one generation younger than you), they are "once removed". If you want to learn more about "Once%20removed" you can visit this url: Once removed.

It's also worth noting that you are the "first cousin once removed" to your cousin's child as well. The relationship is reciprocal. The term "cousin" can be difficult, therefore understanding "Cousin" is helpful in this matter, if you want to learn more about "Cousin" you can visit this url: Cousin.