u/herdingsquirrels

My adopted brother was recently offered a job he was really excited about but for some reason he mentioned being adopted. The hiring company has a race based preferred hiring process so even though he qualifies through either set of parents and they shouldn’t even know he’s adopted because his birth certificate was changed they’re demanding he provide his bio moms birth certificate before he can be hired.

His mom was incredibly abusive, he has zero contact with her for a reason. Any ideas on how I can help him get a copy without contacting any of his bio family?
We’re in California, they don’t have the same last name, we know where she was born and our dad went to the vital statistics office in that county. He was told no.