Ferguson police are investigating a fight between members of Michael Brown’s family on Oct. 18, stemming from a disagreement over who has the right to sell commemorative shirts.

Pearlie Gordon, 54, the mother of Michael Brown Sr.’s wife, Calvina, said she was one of three people selling “Justice for Mike Brown” T-shirts from a tent outside Red’s BBQ, at 9300 West Florissant Avenue, when a group of 20 to 30 people rushed them about 1:20 p.m..

Gordon said Lesley McSpadden, Michael Brown’s mother, told her she couldn’t sell the shirts. Gordon said she told her she was Michael Brown Sr.’s mother-in-law, and unless McSpadden had a patent on her son’s name, she was going to continue. Gordon said in an interview that she and her son-in-law sell shirts, bandanas and other Brown memorabilia at the tent and over the Internet.

Gordon was “repeatedly struck in the back and left side of the head by an unknown subject,” according to the report. She said McSpadden ran up and punched her. Gordon told police that her friend, Tony Petty, was also attacked and was taken by ambulance to a hospital. Gordon said $1,500 in merchandise and $400 were stolen.

Lynne Perkins, a lawyer for McSpadden, said, “My client denies that she assaulted anyone.”