Two men and a woman assaulted Eddie Franklin, 52, at a station near Plymouth and Evergreen, the Queen of Soul's spokeswoman tells the Detroit News.
Other details were scarce. The female suspect appeared to be about 19 years old, and one of the men had dreadlocks. All three were African American.
An unidentified person at the station took Franklin to an area hospital and then filed a police report, according to authorities. Word of Franklin's condition was not immediately available.
Aretha Franklin, 68, who had Eddie when she was 16, is one of the most decorated singers of all time, having won 20 Grammy Awards.