No - not unless he works in Detroit.  If he works in Detroit and his wages exceed the exemption allowance ($600 per exemption), he would file a nonresident Detroit return.

If he does have to file a Detroit return, it can be e-filed along with your Michigan return.  (Other city returns have to be mailed.)

Please see this TurboTax article:  Which city tax returns can I do in the TurboTax state program?

Here are instructions for accessing the city returns for Michigan.

If you are still working on your MI return:

1. As you go through your MI return, you will see a screen, Which Cities Did You Live or Work In?  Select  your city from the list in the box and click Continue. 
2. Once you have completed your Michigan state return, TurboTax will ask you if you live or work in any of the cities that have local income taxes. Mark the box for your city (if it isn't already marked]. 
3. Continue through the screens, entering the requested information.
4. At the end you will be given mailing instructions for your city tax return. 

Please keep in mind that you will have to print out and mail your city return.  TurboTax will give you the address.

If you have already completed your MI return:

1. Go back into your MI return Michigan taxes are ready for us to check, click the Edit box next to Other Situations. 
2. On the screen A few things before we wrap up your state taxes, click on the Start/Revisit box next to Michigan City Tax Returns. 
3. Proceed with Step 1, in the first section.

Thanks!