LOL...we told our son at ages 4-8 or so that we’d pay him a buck on family car trips if he could keep quiet for a minute. We never paid him, either.
We also gave the two older girls and our sons about $5 in quarters at the start of the trip. If they asked “Are we there yet?” or “How much longer” they would have to pay us $0.25. The girls always arrived with all $5 and our son was broke.
We I went on trips with my daughters I gave them $20 and everytime they misbehaved I got $1. After a few bucks the car got real quiet