To nip a gambling habit in the bud?

[TigerDrivesAgain]

DS was adamant that Fireman Sam's fireengine was not called Jupiter. I told him he was wrong. He bet me £1,000 that I was wrong. Now that we have Googled it, AIBU to dock his pocket money for the next 9 and a half years to point out the error of making bets recklessly?

Absolutely NBU!

Do it. Nothing like a competitive parent to make them realise the error of their ways...