I'm the eldest of 4 Sisters from the same parents. We are all so unsimilar from each other. I definitely can see us gathering and sitting in judgment of each other. I'm 14 mos older than one of my sisters, 5 years older than another and 14 and 15 years older than my youngest sisters. When we have gathered we have actually had common observances of the parents though. There were 3 brothers also. .one 1 year older, one 11 years younger and one 12 years younger.
It seems our experiences when our parents passed were way more common than these girls seemed to have with each other but definitely understandable.