Ugh, my father in law is so annoying. I want to tell my 15 yr old daughter to call my him a donkey
I think you have a very complicated relationship with your FIL, do you really want to do that?
Yes, because I want her to be bold and move on.
While I understand that you may feel like you are teaching your daughter a lesson, I don't think it's very appropriate for you to force her to call your father in law a donkey as you can ruin a potential relationship between the two. How about you try to schedule a trip with you and your father in law so that you can try and fix your relationship with him and have your daughter to get to know him as well.
I'll keep that in mind.
I really hope you can manage to go on that trip or at least spend more time together. It'll be great for all of you to know each other better.