Here in California or at least in my neck of the woods when you join a senior center and are over 65 you can get free legal advice by volunteer lawyers or paralegals. I took my mom in when she needed legal advice and we were very happy with the results.
Not knowing your situation I don't know if the legal advice you need is for your dad or you with regards to your dad. My mom gave me power of attorney before her health started to fail so that made things easier for the family and there was never a need for an attorney after that.
I wish you all the best in this.