Conditioning the return of stolen property on the payment of money is . . . extortion? No?
Father committed a crime and a tort when he copied the game. The son's position appears to be, "you should be thankful my father stole this content, and give me a hefty finder's fee to get it back."
The NFL should lower the offer to 15k and tell this guy he has 10 days to turn over the tape or the lawsuit gets filed.
If you want some insight into who controls what, consider this:
You intentionally infringe a valid patent to make money and you're, maybe, liable for triple lost profits. No criminal liability.
You intentionally infringe a valid trademark to make money and you're, maybe, liable for damages to the brand and maybe triple damages. No criminal liability.
You intentionally copy and sell 20 Cyndi Lauper songs to your buddy that are copyrighted and you are liable for 3 million dollars in damages and up to 60 years in jail.