Second cousins are the children of your parent's first cousins. This means that you share a set of great-grandparents with your second cousins, but not grandparents. For example, if your mother has a cousin, that cousin's child is your second cousin. In family trees, second cousins are typically found two generations down from the common ancestors. They are part of the extended family, which can include other relatives like first cousins and third cousins. While second cousins may not see each other often, they can still share family traditions and history.