What law lets 17 year olds move out in Michigan?

I have an uncle that is treated bad at home and now lives with me. I have done research and all I have found was that he is not a minor yet he is not at age of majority. We called a couple lawyers and they said he can leave at 17, which law states this? If possible can you give me the section code like (MCL 28.258). I am in a hurry and would greatly appreciate any help.