Step mom manipulating my confused father to liquidate assets, and sell real estate. What are my legal rights?

So you go to an attorney and ask for an independent third party to protect the person and property of your father. This is called a Guardian. The judge would remove her as a POA if she is incapacitated by alcohol, but this would have to be clearly established. You are treading on thin ice and your father and step mother will be outraged if you attempt to take control and may cut you off. It will be far better to have court-appointed guardian than the present situation.

It doesn't seem like you have any rights in this as she is the wife. If she was declared incompetent then you might have some rights. Do you own the property with them or the investments with them? Otherwise it is a married couple thing and you are the outsider. She may accuse you of meddling. Just make sure your dad is being taken care of properly.

Actually trust says she is only POA if he is declared incompetent/incapacitated. He is, but has not been declared by 2 physicians, as required. I could get that easily. But she would still be primary poa, and me as alternate.

She is his poa, but is ? trying to liquid real estate from trust. She is trustee, I am alternate.

She is an alcoholic, and recently I asked to seek help. She went in for alcohol treatment, is drinking again, taking care of my dad....but can barely take care of herself.

Agreed. You just have to keep out of this but make sure Stepmom is taking proper care of Dad. If she liquidates everything and takes off with the loot and Dad has to be institutionalized on Medicaid they will be hot on her tail.Is she much younger than Dad?

You have none. His wife continues to take precedence unless there is a pre-nuptial agreement saying otherwise.