Terms such as aunt, uncle, grandfather and grandmother are easily understood. However, the terms first cousin, second cousin, third cousin, great-uncle and great-aunt are often less clear. Let us clarify them.
First cousins are cousins who share a grandparent. The difference between them and the grandparent is two generations. Second cousins share a great-grandparent, a difference of three generations. In the case of third cousins, they share a great-great-grandparent. The difference is four generations.
Great-uncles are brothers of one's grandparent and great-aunts are sisters of one's grandparent. In relation to one's parent, great-uncle are the uncles of one's parent and great-aunts are the aunts of one's parent.
Cousins who share a grandparent are first cousins. Those who share a great-grandparent are second cousins. In the case of first cousins, their common ancestors represents a difference of two generations. Great-uncles and great-aunts are the brothers and sisters of grandparents.
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