You can claim your brother as your Dependent on your Federal Return if he meets the criteria in this link Who Can Be Claimed as a Dependent.
If your brother is over 19 (or 24 if a student), he would have to live with you all year to be claimed as your Dependent.
If not, he still have to live with you for over 6 months.
Is it also okay if Michigan increases my return even though he never lived in Michigan?
You can claim your brother as your Dependent on your Federal Return if he meets the criteria in this link Who Can Be Claimed as a Dependent.
If your brother is over 19 (or 24 if a student), he would have to live with you all year to be claimed as your Dependent.
If not, he still have to live with you for over 6 months.
Is it also okay if Michigan increases my return even though he never lived in Michigan?