My question involves guardianship in the State of: Michigan

My sister is the guardian and medical power of attorney of my mother who is 80 years old. One of my brothers is the financial power of attorney. My mother has alzheimer's/dementia. There are five of us siblings and it was recently decided to place my mother in a home for people with dementia. There has been disagreement between the five of us between two places in which to place my mother.

My question is legally who is the one who can make the final decision, my sister who is guardian/medical poa or my brother who is financial poa?