I had a relative that was a child during WWII and they had some very distinctive (borderline maladaptive) 'quirks' .... One of which is they would never take t

I had a relative that was a child during WWII and they had some very distinctive (borderline maladaptive) 'quirks' .... One of which is they would never take the last item of anything from out of the fridge (eggs, cheese slices etc) and would become irate if anybody else did. They (much like your grandmother) were also unable/unwilling to throw anything out 'just in case'.