As the fourth cousin chart illustrates, a fourth cousin is someone that is descended from a full sibling of your great-great-grandparent. In a general sense, an actual fourth cousin is a person with whom you share great-great-great-grandparents. First cousins share grandparents, counting back two generations to their shared ancestors as per the cousin chart here. Now, if your cousin counts back three generations while you count back five, then you would be second cousins twice removed. The second here would be the number of generations back your cousin counted to a common ancestor or great-great-great-grandparent. With EdrawMax, you can easily create such cousin charts for your usage and understanding.
