Wilson, 16, was brought on as a substitute during Wales' 1-1 draw with Belgium, thus preventing England from nabbing the dual-eligibility youngster.
Well things just got better for Wilson's family.
In 2000 - when Harry was a wee nipper - granddad Pete Edwards, made a bet on his relative turning out for Wales at senior level.
With odds of 2,500-1, that £50 punt has earned grandpa Pete a whopping £125,000 - and an early retirement.
"Mr Edwards has been able to quit his job as a result of his amazing ability to spot fledgling talent earlier than almost anyone else we've ever taken a bet from," Graham Sharpe, a spokesman for bookmaker William Hill, said.
Grandpa Pete, 62, was delighted at being able to take early retirement - as was his missus, Dorothy, who has had to contend with the electrical contractor working away from home for most of the year.
"She is over the moon. I retired immediately. I told my manager yesterday that if Harry plays I wouldn't be coming back," Pete said from a caravan in Buckingham, where he was on his latest job.
"I've retired one year early. I have come home now and will not be going back. Not bad for a daft bet."
It could, in theory, have been a bigger payout for Pete - when Harry was 12, he went back to the bookies and asked if he could increase the bet.
Alas, they refused - realising the youngster's potential had decreased the odds somewhat - but as a gesture of goodwill threw England into the existing punt.