Yes april1 and it was Sheila whose problems manifested themselves first with Ralph and June:her low self-esteem brought about by her failure at school,and then the incident in the fields whereby June called her the "Devil's Child",which gave her a guilt trip about sex. Of course Jeremy also had low self-esteem,but he could escape this feeling through bluster with the other boys. Sheila did not have the wherewithal to renounce this feeling of worthlessness.
Here is where we may disagree. Sheila soaked up the reproach of her mother and found no outlet for it. Though it manifested itself through her illness she did not blame or take her revenge out on others. Jeremy however had a seething rage which he kept under the surface and learned to conceal his feelings which he saw as a weakness as he had confessed to being illegitimate which only resulted in him being labelled "The Bastard" by the other boys at school. Jeremy resented the attention Sheila was getting from his parents,who took their eye off the ball focussing on Sheila to the exclusion and detriment of Jeremy.
I recognize all you say of Sheila from my own childhood. What may not be obvious to you is that when somebody feels worthless, they also DON'T believe they have any right to anger, which would be a much more positive emotion. But the anger is there. It is internalized. Maybe Sheila needed drugs to help her keep a lid on her anger. My own theory, shared by many, is that suppressed emotions will find their way out in the form of illness, for me nothing wildly dramatic, just mildly debilitating but still there, all these years on. Maybe Sheila's mental condition was about the anger she couldn't allow herself to feel and when it finally exploded she was unable to control it.
Jeremy's relationship with Sheila. Hmmm. Sibling rivalry is a given, but in the case of a child who feels unloved it's often the case that they see every other child as receiving unbounded love. I would bring other children into the house in the hope that some of my mother's treatment of them would rub off on me. Maybe June found Sheila more malleable than Jeremy and he saw that as her getting attention he craved. To a child, ANY attention is better than no attention.........which brings me to a point you made in an earlier post about a lack of love. I imagine that with such high standards expected of them, both children found it difficult, at times, to feel loved. I think that what was missing was overt, demonstrated love of the type children need to see in order to feel. Children aren't capable of recognizing subtle and understated. I would agree with you that the atmosphere was more likely to be polite and repressed than joyous and spontaneous. I may feel more inclined to agree with you that Jeremy was responsible for what happened if there was evidence of any internalized anger erupting elsewhere at other times. The internal "bottle" will only hold so much before it explodes and it would be unreasonable to assume that his relationship with his parents was the only thing in his life which gave him cause for anger.