The parents of your father and/or mother are your grandparents (your grandmother and/or grandfather) and their parents are your great grandparents. Your parents' brothers and sisters are your uncles and aunts. The brothers and sisters of your grandparents are often called your great uncles or great aunts, but this is incorrect. They are actually your grand aunts and grand uncles. The brothers and sisters of your great grandparents are your great grand uncles and great grand aunts.
What about the cousins?
You may have heard some cousins referred to as your 1st cousin, or 2nd cousin. You may have even heard of them referred to as your 2nd cousin once removed. These relationships aren't as difficult to figure out as it seems.
I often struggle to find websites with thorough explanations in simple language to help kids understand historical events or scientific concepts, so I decided to create some of my own!