You and your kid are at the fair waiting in a long line. A father and daughter cut in line. What do you do?
I'd start with something relatively non-confrontational such as, 'Excuse me, the end of the line is back there". I've almost never had to go past that because others in line also indicate their displeasure, too. I don't yell -- I can't remember the last time I raised my voice. I almost never have to.
After, when i was alone with my daughter, I would debrief her experience,discussing with her how she felt during and after the other couple cut into the line. I would define it as a potential learning moment for her, and an opportunity for me to reflect on how i felt managing the moment.
I'd let it go. Back in the day, I would have gotten really pissed about it and said something. But I have learned that I make very few good decisions when pissed so I try look at the bigger picture. As long as it isn't a lot of people cutting line, it is unlikely to really impact how long I wait for the ride. Perhaps there is a reason they cut in line other than self entitlement. Maybe the kid is disabled. Regardless, if they are willing to cut in line, they want it way more than i do.
I would say, the line starts back there. If they don't care, I would tell my daughter that this is rude and boorish behavior and that this man apparently thinks he is entitled to act that way. He is not. He is teaching his kid to act like a jerk, so other kids won't like her. And then ask the jerk, if I got all that right, and would he go back to the end of the line where he belongs.
I was next in line to check baggage for a flight. A guy briskly walked up and stepped in front of me. Without thinking I horse collared him and yanked him out of line. He was shaken. He stepped in line behind me and started talking in my ear about how my behavior was inappropriate. I loudly told him that if he went to every person in line behind us and got their permission to go first then I would gladly let him go first.
I hate that crap.
You did not specified how long you will maintain the poll open before making a decision. Reckon is a long line worth the wait. My kid is 6'4" former afghan security veteran. He is the one taking action, my job will be watch his back and pick up stragglers.
My answer is "it depends". Some lines are so disorganized that reasonable people have trouble figuring out where they end. Sometimes people are preoccupied and don't pay attention. I don't assume it's personal. The way I've seen people handle it is usually to point out, with a smile, where the end of the line is, and I've never seen anyone refuse to go to the end (or even be sullen) when it's pointed out.
I've even had people do that to me. It's never because I'd actually cut in line on purpose.
Sometimes it works in reverse. I was in a deli not long ago and there was an order line and a payment line and it wasn't clear in the cramped space where the line was or even what the intended order of operations was; some people appeared to be going to yet a third location to order a particular ice cream product. I asked around and half the people there weren't sure WTF was going on. But I did notice that half of them were happy to act like my questions were stupid. Likely they were people who had been there before and knew the ropes, so it was obvious to them.
In this, as in all things, humility and not making assumptions are helpful skills.
I find these days confronting someone will most likely cause more trouble for you than it does for the offender.
I recently told some older guy pushing past a bus queue to get on first, that there was a queue and was told by others in the line I was a bully, complained about and the man was allowed to get on by someone further forward in the queue.
A day later the same thing happened and this time I just stood aside to let the person on and was bawled out by a woman behind me for allowing queue jumping.
I'm getting taxis from now on.