Since they’re not old enough to vote, or tar-and-feather a legislator, I give them a pass.
They should make the lemonade free and have a tip jar for voluntary donations to their cause.
With a little imagination they could even raffle a lemon and end up with enough cash to take Dad to Splash Kingdom.
That’s exactly how my two daughters did it. I instructed them to make a sign saying “Free Lemonade! Donations accepted”. They misunderstood and wrote “expected” instead of “accepted” but they still made about $45 in an hour and a half next to traffic slowed by rush hour through our town’s bottle neck N-S main street. No hassles from the local constabulary.