You have to go to court and ask. You should have a doctor's statement regarding her condition. If none is available, then you will have to have affidavits of others who can talk about her mental condition. I suggest contacting the Idaho State Bar and getting a referral. In a way it is not hard, but making sure all of the I's are dotted and the t's crossed will save you a lot of pain later.
You would need to file a Pettion for Guardianship and send notice to all the appropriate relatives including your mother. Your mother will have a chance a contest the Guardianhip.
You file a petition for guardianship and conservatorship with the local court. Notice must be given to the other interested parties (your siblings, the other parent, etc.). The court will have a hearing. You may want to have a letter or testimony from your mother's physician. If the court determines that your mother cannot handle her own affairs, they can appoint you to take care of her personal affairs and to manage her financial assets. In Utah you will need to take an online test to demonstrate that you understand what actions you can take and what things you cannot do as a guardian and conservator.
If you do not have a durable power of attorney or an advanced directive for health care, you will probably have to have a judge declare your mother incompetent and appoint you as her guardian.
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