HUNTSVILLE, Ala. (WHNT) — For a lot of people, a birthday card might have a sweet message, if you're lucky, a little bit of cash on the inside, and then it will end up in the trash or tucked away in a drawer somewhere. Although one family took a simple card and turned it into 50 years' worth of history.

That story started 51 years ago. It was June, and David Nillson was turning 16 years old.

That's when his cousin, Amy, decided to send him a birthday card.

"It says happy birthday to a good-looking relative, and on the inside it says save this card and you can send it to me on my birthday," said Amy Uptain. "And I did not think anything about it."

Flashforward 10 months later, it was Amy's birthday, so David decided to return the favor and follow the directions in the card.

"Being a 16

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