Here are three key traits of Aunt Clara with three supporting things George or Lennie say (or think) about her from the novel. I paraphrase the relevant lines and give chapter references so you can check the text.
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Trait 1 — Caring / Nurturing
- Lennie repeatedly remembers that Aunt Clara used to give him mice to pet (Chapter 1) — this shows she tried to comfort him and provide what he loves.
- Lennie speaks of her as the person who looked after him when he was small (Chapter 1) — he depends on the memory of her care.
- George explains that Aunt Clara used to be the one in charge of Lennie and that after she died George took on that responsibility (implied in early chapters) — this confirms she was his caregiver.
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Trait 2 — Strict / Disciplining
- Lennie recalls being scolded by Aunt Clara when he did something wrong (the idea appears both in his memories and in his hallucination in Chapter 6) — showing she corrected him when needed.
- In the final hallucination (Chapter 6) Aunt Clara appears and reproaches Lennie for not listening to George, which reinforces that she used to discipline him.
- George’s repeated warnings to Lennie about behaving echo the kind of discipline Lennie remembers from Aunt Clara — he is the adult enforcing a similar control (throughout the book, especially Chapters 1 and 3).
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Trait 3 — Protective / Realistic about Lennie’s limits
- George and Lennie’s conversations show that Aunt Clara knew Lennie’s simple needs and limitations — Lennie’s memories make clear she tried to keep him safe and comfortable (Chapter 1).
- Lennie calls on Aunt Clara’s memory when he is frightened or guilty (for example, when he has killed small animals or when he’s scared at the end) — he expects her to understand and protect him emotionally (Chapters 1 and 6).
- The hallucinated reproach in Chapter 6 also suggests she understood how dangerous Lennie’s failure to control himself could be; her appearance in his mind underlines that she was someone who both cared for him and recognized his problems.
Short summary: Aunt Clara is remembered as a loving caregiver who also disciplined Lennie and understood his limitations. The evidence comes mostly from Lennie’s memories and his final hallucination (Chapter 6), plus George’s remarks in the opening chapters that establish Aunt Clara as Lennie’s former guardian.