Think that you need to do two things before putting too much into this. And leasing is the smartest way to go here, no question.
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Have a sit down with Mom, DD and a calculator. How much is that horse going to cost each month to lease? What are your costs to board that horse? What is your time worth per lesson? Do that math with them. Then figure out how many hours she will commit to working each week and be sure they understand it is a commitment not wishful thinking. Then you figure out how much is fair. IME it works best to track the hours or tasks then balance that total against the monthly horse costs.
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Ask that kid how much of the Pony Club manual she has read? Start quizzing her on basic knowledge. I know what she and her Mom say but…teens at that age with doting parents often are clueless how much work is involved for not so much credit and reliability is not a suggestion.
Some of what you have shared is concerning and you are too close to mom as a friend, maybe, to pick up on some nuances in what mom says and how she says it. And then there is Dad, who you have some doubts about from what you have told us.
Plus that, people looking to work off board and lessons often seriously underestimate the amount of money it actually costs and the time involved. Then overestimate how much credit they can earn against that working part time…or even full time.
Great to offer this kid some help but be realistic and, sorry, but if you are doing this partly to get a farm sitter? Does not sound like the best candidate. Not right now anyway.
Last time I worked off expenses I clocked in and out, credit was $10 an hour. Usually put in 8-10 hours a week. Realized it really did not make sense spending days off the regular job doing barn work to credit a few hundred towards almost 1k+ of expenses and that was before costs really skyrocketed. Did continue to work at in barn shows and was cut a check for that time.
Do not forget vet and farrier come on top of that. You can tell that to people but they either do not listen of file it in the dust bin of unimportant trivia. Until they get a middle of the night colic bill.