Are you referring to the names in the case title: Rosella Eddington and Terrance Gainey? They are just plaintiffs #1.
Freddie Gray is plaintiff #2. You can see his name right at the bottom of page 1.
That was in 2007, or 8 years ago. Freddie would likely have been under 18, so I think his parent/guardian would have had to be party to any lawsuit.
Freddie Gray Sr. Not Freddie Gray Jr.