I totally agree with you! The sisters can be real bitches to eachother. Possibly because they are so cramped and unhappy in their own lives so they set about making eachother unhappy.
There was once this holier than thou pioneer sister who never stopped boasting about how poor she was because she pioneered. Anyway she used to constantly ask me how much I earnt, was the outfit I was wearing new? How much had it cost? And all so that she could scornfully say to me that she couldn't afford stuff like that because she pioneered!!