How can I be my grandmother's guardian?

You should file to be appointed the Guardian and Conservator for your aunt. It is an involved process and you should be cautious about attempting the appointment without the assistance of counsel. That being said the are forms and instructions available in Maricopa County at http://www.superiorcourt.maricopa.gov/SuperiorCourt/Self-ServiceCenter/Forms/ProbateCases

You have to file a Petition for Guardianship with the Court. There are two forms of Guardianship, Person and Estate. Person addresses day to day decisions about your grandmother, such as making sure she has the proper medical treatment and care. Estate is control of her assets and making sure her bills are paid. You will need a report from her doctor stating her medical diagnosis and why she is not capable of caring for herself. I would recommend consulting with an attorney who practices in guardianship before you file.

Call the county department that handles elder issues, they may be able to help you with a guardianship.

You have to go to court and ask the court to appoint you to be her guardian and conservator. It will be very helpful if you can have a doctor's report regarding her condition as part of your petition. You will also need to identify any of her children that are still alive, and if there aren't, then her grandchildren. Again , it would be helpful if you had consents from all of the interested parties. Finally, the court will appoint a guardian ad litem and a court visitor to give the court an independent analysis of the situation. Your grandmother's estate will be responsible for those costs.