Double stones signify one of two things. What I mean by double stones is a grave marker that gives the impression of being two markers smashed very close together – if the marker was paper instead of stone, you could fold it right down the middle and have the outline of one tombstone. I’m not sure I’m explaining myself clearly, so let me post an example.
As I was saying, double stones signify one of two things – or really, relationships. The double stone we might think of immediately is a stone for a married couple. But in the 19th and early 20th centuries, a double stone was often used to signify siblings.
Now of course a married couple could die tragically young, but a double stone almost always signifies very early death. If a child had reached adulthood, he or she would likely be married and buried with a spouse. Not only that, but a double stone indicates that a family lost two children very young.
A Grave Concern 