Disabilities, medical conditions, and potty breaks are a different situation altogether and not meant to be addressed by my post
The mom at Legoland was clearly dealing with none of these issue (I watched her for some time before her kids actually cut in front of us and I told them to go to the back, at which point she rushed over to rescue her kids, yelled at me for “not allowing” the siblings to ride together, and loudly told her son that he could not ride because “THAT LADY [pointing at me] said so” and then glared at me when he started crying). The previous poster’s question also was about cutting the line due to timing and weather, which are going to be a factor for everyone wanting to ride RoTR that day.