His wife filed for divorce. I am a WA resident. I have hired ND lawyer, this has gotten me nowhere and I'm in a financial burden and cannot afford to keep paying a lawyer on his behalf. I terminated my contract with ND lawyer and now he is warning me excessively that ND state filial law will come after my assets. Isn't his wife whom he is still legally married to responsible for his bills? They have money.
I also assume since your Dad and his wife have no money, that Dad is being cared for through Medicaid. And that it is Medicaid who is paying for his room, board, and care in the Nursing Home. If yes, I cannot see any reason for Medicaid to come after you.
The type of Attorney you need to see if a "Elder Law Attorney", one who specializes in all things regarding the Elderly. Plus such Attorneys know the ins and outs of Medicaid. Go to the bottom of this page to the blue section... click on ELDER LAW ATTORNEYS... go the search for an Attorney mode, there should be a list of "Elder Law Attorneys".
Persons with dementia can legally sign certain documents if they demonstrate they understand them. Here is what an AC expert says about that: https://www.agingcare.com/articles/elder-cant-sign-will-trust-power-of-attorney-153521.htm
Surely you received some advice for your money?