Your husband has given your daughter an immensely touching gift. I'd encourage you to give your daughter the letters, as soon as it feels right to you.
These letters represent a desire to do something that is impossible for humans, but achievable for love: to reach out and touch the future.
Your husband's prognostication about weddings and children aren't wish fulfillment so much as a reflection of his hope that your daughter is happy in life.
While the letters may contain hopes for a path she's not taking, you can frame them as what they are: the continuing echo of his love.
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