He requested his aunt/Aunt.
I wonder whether the word aunt to be captailized.
" I found this at another site: Rule 1: Capitalize a kinship name when it immediately precedes a personal name or is used alone, in place of a personal name. Examples Andy and Opie loved Aunt Bee’s apple pies. We adore Uncle Malik, because he always treats us like royalty when we visit him.
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First, your grammar would be better if you asked "I wonder whether the word aunt should be capitalized" or "When is the word aunt capitalized?"
I found this at another site:
Rule 1: Capitalize a kinship name when it immediately precedes a personal name or is used alone, in place of a personal name.
Examples
Andy and Opie loved Aunt Bee’s apple pies.