My siblings convinced my father to change his will and set up a trust. They farmed his land for the last 7 years and bank documents show that he did not get paid rent for one year and other years he was paid half of the current market rates. They have a lease that was signed two years ago and now claim that they have a right to continue farming the land at the low rental rate.
My father was diagnosed with Alzheimer's and vascular dementia in 2005, before all this occurred. There is a no contest clause in the trust.
Do I have any legal options to have the trust thrown out and/or pursue dependent adult abuse charges?