Ok Anna was worried about bugs getting into the coffins. 2 double plots were purchased - Maybe those 2 double plots were for just Anna and Daniel. If she didn't like bugs then most likely she like the idea of 2 caskets being stacked on top of each other into one plot and that may be why she bought 2 plots do avoid double stacking of the coffins. Just because the cemetery allows double stacking of coffins does not mean it has to be done that way.
I wonder if they require concrete inground vaults so that grave does not sink in.
Personally I would never want a double stacked plot with my husband's coffin under my coffin or on top my coffin. I would rather rest side by side with him. (this includes any of my children). Put me 6 feet under but not 10+ feet under.
'Lack of time is NO reason to ignore the rules of evidence, judge.' council from Texas thunders.
correction
If she didn't like bugs then most likely she DIDN'T like the idea of 2 caskets being stacked on top of each other into one plot and that may be why she bought 2 plots do avoid double stacking of the coffins.