Stay strong! It really isn’t your hassle when push comes to shove. Sounds like Aunty is running out of stalking horses and might (shock! horror!) have to do the insisting herself. Which will probably be good for her soul if not her temper. Is she the executor? Or has she taken this work onto herself without authority?
Hrmm. This is a difficult one to navigate. Probably best to keep your distance as you have been. Wishing you much patience. Keep your temper no matter what is probably for the best.