I think you've done well. You can add the bit that anatess talked about for a broader 'outside the family' view and the pet's impact. Up to you. My advice is if he still doesn't go for it than don't pester him or get depressed. Wait awhile for things to cool off and try again. The Expo should really help. That way he can see for himself all the kids that are running around NOT getting eaten, and knowledgeable people that can confirm the info in your letter.
Good luck to you
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