This threat reminds me of the same situation from last summer that I will most likely also have to deal with this summer. I am a college student and take my horse up to school with me during the school year and keep him at home with me during the summer.
Every summer for the last two years my boyfriend’s mother always nags me about riding my horse. And he really is a great horse, totally beginner safe. And I do let my boyfriend ride him and take him on trails and give lessons on him too. But my boyfriend’s mom is always complaining about various injuries or her back and has had back surgery in the past, so I just don’t feel comfortable having her ride my horse. Plus she keeps talking about wanting to take him out on the trails and gallop him, which just isn’t happening. So I’m dreading bringing my horse home in May and dealing with it again. I think I should just tell her for insurance reasons I don’t feel comfortable letting her ride him, which is true partly, because I board him at a private barn. And she is not the most trustworthy person in the world in my book, so I worry if she hurts herself she could sue me blind. Is that even a possibility? But I also don’t want to piss her off since she will most likely be my future mother-in-law…