It’s simple: “Figure out the common ancestor between two relatives. Then select the relationship of the first relative to the common ancestor in the top row. Move down to the row that corresponds to the relationship of the second person to the common ancestor. The result is the relationship of the second person to the first.”
OK, so maybe that isn’t so simple after all. I am not sure if a chart is worth a thousand words or not but a cousin relationship chart at http://flowingdata.com/2014/11/05/chart-of-cousins does save a lot of words. It is easier to understand than the above explanation.
See you yourself at http://flowingdata.com/2014/11/05/chart-of-cousins.