You have gotten a lot of great advice here, the only thing I will add (and maybe it was said but I didnât see it while reading through replies):
IF you agree to some sort of visitation schedule be sure to put in an END DATE with all the other qualifiers discussed - parent must be present, must listen to your direction, the sessions will be a max of 2 hours, on a set date and time, etc etc. And put it all in writing, including that you can change the arrangements at your discretion (especially they âviolateâ the terms by leaving the child alone for example).
Donât put the end date of the visitation agreement as something years out - you can put it as something that aligns with a regular set of classes (IE if they put their child in lessons, would it be a 3 month arrangement?).
Each time that duration expires, you can agree to another period of time - another 3 months for example. The key here is that YOU are setting the parameters of what is acceptable. Nothing should be open ended or left for interpretation.
If it were me, though, I honestly would just put a full stop to these visits. If you arenât cold-hearted like me, then you could possibly see about scheduling a time to haul in to the other barn for the child to take a lesson with you as someone else suggested. But I would NOT be allowing any visitation on my property. Full stop.