Well, if your Grandfather was the only one on the deed the loan officer who did what they did, did not have to tell the family. Your grandfather signed the loan documents agreeing to the loan. The good news, most likely the loan officer LIED on the loan documents about your grandfathers income, but again, most DA's will not go after the loan officer unless they can prove at least 3 cases or complaints against the loan officer. Most likely the scum of the earth who did this to your grandfather is/was probably not licensed with the department of real estate. You can check that by googling California Department of Real estate, once on the website, there is a small yellow box, click on it, then last name first and search, then, if they are licensed place a complaint with them. Most likely the person is not in the business anymore! What you can do, if there is any equity left is a reverse mortgage, get some money for your grandfather and on a reverse mortgage there is no payment. Many people are against reverse mortgages because they do not know how they work, this could save your grandfather's home if there is equity, and the property will make payment to him! When he passes the heirs still get the remainder of the equity, it does not go to the BANK! You can e-mail me with further questions if you would like.
There is no way this will be plead down to a lesser charge. They have you cold on DUI, at a level quite above the legal limit.
DUI's are almost never plead down, they are pretty much impossible to lose for the DA. With a BAC of almost double the legal limit, no Judge would even allow this to be plead down. You will have to face the consequences of your actions.