I agree the younger sisters do not compare with the two elder in kindness, compassion, empathy, and care for the feelings of others. Lydia, Kitty and Mary are all very selfish and really unable to empathize well enough with others to do the right thing as shown when neither Kitty nor Mary helps Jane in Chapter 47. Lydia never listening to anyone does not imply she has no affection for anyone. Lydia said she wished Mary had accompanied them to the inn; I do not see how Mary's response changes her original sentiment. Kitty cried from envy and vexation because she was not invited to Brighton but that does not change her sorrow at the loss of her favorite sister in Chapter 47. It is true Mary could not be bothered to walk to Netherfield but it does not take away from the concern she expressed for Jane earlier in Chapter 7. I am sure there are many other contrary examples of the sister’s feelings and less than feeling treatment of each other but my point is the deficiencies of attention to their sisters shown by Mary, Kitty, and Lydia are indicative of selfish people but I do not think it swipes clean the small bits of affection they do have for each other. My purpose was not to show them as shining examples of sisterhood but to show while they are deficient they are not completely empty of affection for their sisters. ;D