How can I get a hold of my Dad's finances to help pay for his NH and care?

I have DPOA for my Dad. His wife has been horrible to him their whole marriage. She can't wait for him to die. She has done NOTHING for him their whole marriage except verbal abuse him. She keeps trying to take his money that is just in his name. The cops have been called so many times - she is losing her mind and is very crazy. He broke his hip in November - had surgery, got the flu a month later. He was put in a nursing home/rehab but the 100 days of Medicare is over. He is now in the hospital and the doctor has told me he is in the dying process and will NOT get better. Hospice is coming to my house to talk to me tonight - The hospital is ready to release him but needs to know where he is going to go- which nursing home. The previous nursing home has refused to let him come back. The reason is b/c my step-mom refused to pay for his care. Like I said I have DPOA - He signed for me to be on an account so I could take care of him but my Step-Mom found out and went crazy at the bank so the account has been put on hold. If I don't come up with a way to get to his finances in the next 2 days - I will not be able to help him. He has a 401K but his work said he is the only one who can request to get money out of it. He is not in a condition right now to think straight or sign anything. I feel as though I don't know what to do. I know he has stocks but it is in a safe at his house where my step-mom lives. I don't know how with me being POA to get those.

She has told numerous people she is not paying anything for him. He can't go to her house and he needs pretty much 24/7 care which costs a lot. I am pretty much his only Hope but I was going to try to get Guardianship - per my attorney but I don't have time now....My attorney hasn't been much help other than suggesting Guardianship. I have also called Adult Protective Services on her per my attorney and the other nursing home he was in.

This is a huge mess and I don't know what to do!!!