The Question and Answer section for East of Eden is a great resource to ask questions, find answers, and discuss the novel.
Your questions are really involved for this short-answer forum. Check out the GradeSaver themes page, especially Good vs Evil.
Samuel, Adam, Cal, Dessie and Tom all lie to protect the feelings of others in Part Three. Is their deception justifiable as a kindness, or is it ultimately a breach of trust? Compare their actions to that of Lee's father. Note also Lee's advice to Adam a
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Samuel is a friend, thus, Lee is comfortable speaking with him in English. Lee's roles are many, he is friend, advisor, parent to the boys and housekeeper.