Looking for advice on guardianship for my father. What questions should I ask the lawyer?

After explaining your situation to the eldercare certified attorney you need to know exactly which type of guardianship your may need. You need to know just how far your are allowed to go before before seeking additional permission from the court. Judges would normally set your boundaries and set guidelines. Have the state laws on guardianship explained.
Look for the online videos that explain guardianship. You may be able to find the questions you want answered, clarified, or need to ask there. Laws may vary from one state to another.
Find out if you would need to file for each of the LO in two separate cases or if it can be combined somehow. Check into financial separation. Check into signing legal documents, including the IRS. I filed an IRS form available online for signing tax returns. SS is another thing, discuss what you may need to do for SS. Ask how to handle bank accounts with the lawyer and the banks.
Hope this helps you some and best of luck.

My father is in Stage 7 Alzheimer's. He cannot understand or respond to what is being said to him. My mother is very ill and on several medications. She has entrusted me to make decisions because she does not want to make any. It has taken me two weeks just to ask her a question. She simply does not want to deal with any issues. I have financial and medical for her. My thought is if she is not in a position to make a decision for my father, I would have to make it, but I need the authority to do so.

Is your father competent? If he is and no longer wants your mother to be his POA he can assign another. If he is not and is unable to discuss with his attorney what he wants then you would have to file for guardianship and a judge would have to agree with you that you would be the right person over your mom to make decisions for your father.
Your father is on hospice. Is your mom not competent to make decisions as needed?
Does she have Financial and Medical DPOA?