Both Rosemary and Lowell have profoundly mixed feelings about Fern and each other. Lowell seems to know that it’s wrong to blame Rosemary for something that happened when she was only five years old, and yet it’s clear that he
does still blame her. Rosemary, meanwhile, feels a uniquely powerful attachment to Fern and yet also (rather understandably) resents her for making the Cooke family’s life so abnormal and difficult.