Gain guardianship of her incapacitated grandfather

My grandfather had a heart attack on the Fourth of July. He is now incapacitated. I finally got him transferred to my area where I can care for him being that I am his only decision-maker and his only next to kin. My parents are past so it’s up to me to handle all of this. I have to hire a lawyer to gain guardianship, Being that he is incapacitated I really need somebody’s help or everyone’s help to help me get guardianship of my grandfather. Currently he is in the rehab phase which Medicare is paying for but eventually he will be in a nursing home…He will be closest to three siblings in Tallahassee and I will be able to have my daughter and myself there every day to lift his spirits. He has brain damage from being without oxygen for over 20 minutes therefore he doesn’t necessarily know who I am, but it’s my duty as his granddaughter is to make sure he is being cared for. I just need help with lawyer fees for guardianship and to handle his personal affairs outside of the medical field. I cannot get a POA due to the incapacitation. Thank you in advance.