The past couple of weeks, this image has been circulating on Facebook, entitled the Cousin Explainer.
Given the huge number of likes (256, at time of writing this) and shares (3,400, at time of writing this), it seems I wasn't the only one who needed this mapping out clearly.
As a mathematician, it always bothered me that I could not explain, or even better 'define', what an mth cousin n-times removed is. Well, now I can. And I share it here so that you can too.