The Nevis family correspondence shows that sometimes letters to one person were occasionally forwarded to another. This one is written to Leonard, who was fighting in the Philippines, then forwarded to Arnold, who was still in communications training in Connecticut.
Aunt Belle was Arnold and Leonard's paternal aunt Belle Nevis Bettancourt (Isabelle or Isabel or Bella). Alvin is her son, so their older cousin by some ten years.
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first post in Arnold's Story July 1943
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