Implement a new standard of expectations immediately.
The parents all need to receive a brief and well worded note on actual paper, explaining the value of horse care in the child’s equine activity. You can site such things as “responsibility to an animal”, “bonding”, “improved safety with improved horsemanship”… Make it a general announce, and no one will be singled-out.
Set a date for the new policy, and have some one hired to catch all the students up on what they need help with. The instructors need to be in the same page and SEND THE KID BACK to grooming area to fix problems before being able to continue.
I tell ALL beginners on my program that the lessons start with getting a horse or pony out of the stall. Then we groom and tack. The first lessons have a grand total of about ten minutes on the horse, and I help with the process to speed things along.
The students EARN riding time by learning handling/grooming/safety. When I can watch them enter a stall, halter a horse or pony,meet them to the cross ties safely, then they have earned coming early enough to groom. Then the lesson starts with tacking. Then they get more saddle time. This evolves to include students tacking mostly on their own, with me just helping with the bridling, since that takes the most time to learn how to do well, and has the most possibility for problems.
I examine tack and grooming first thing in every lesson. if the kid shows up in the ring with tack or grooming issues, they go back out and fix it. Sometimes I may take pity and fix things fast in the ring, but that’s usually just a one time thing.
my experience is that parents will support horsemanship as part of the lesson program if you don’t give them a choice. It’s expected from the start.
I have a sign on my schedule board stating that school students are expected to come half an hour early and stay half an hour after lessons to properly care for the horses.
It is actually an HOUR OF “FREE” HORSE TIME that they don’t have to pay for…
if if some one has an issue with any of this, I don’t want them around my horses in the first place.