Companion and Family Headstones, aka Double Upright Die with Base.
These upright style gravestones are common for couples or for two or more family members. Most cemeteries require a double grave plot for this style.

mahogany granite companion memorial stone  family gravestone 
Double upright die and base  Companion monument 
granite gravestone  granite tombstone 
cemetery memorial stone  cemetery grave marker 
granite monument  cemetery tombstone 
cemetery memorial stone  granite grave markers 
granite headstones  granite cemetery headstone 
cemetery monument stone  cemetery memorial stone 
family cemetery gravestone  campanion grave marker 
family gravestone  upright vertical die and base