I have some points to help me answer this question but i'm just not exactly sure how to start answering it?
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Sheila and Eric have a typical sibling relationship. They can be rude to one another but are also family and really fond of each other.
Sheila and Eric are the same as the usual brother and sister relationship they have arguments but then love each other the next minute, JB Priestly has obviously looked into brother and sister relationships and expressed it in this novel