Just to add on to @SavoirFaire‘s first answer, those are the questions at an existing or former employer should answer and feel safe from a potential lawsuit.
Questions that can be asked by a hiring employer are a bit more laxed. They should still steer clear of anything that might be construed as potential discrimination (Is Dutchess married? Does she have children?, etc.) Questions like, “What are Dutchess’ strengths?” “What are her areas of opportunity?” are acceptable. The former employer shouldn’t answer them, but it’s amazing how many do.
As for a third reference, a former co-worker should be fine. Why any hiring manager would want these types of references is beyond me though.
Good luck, and keep us posted!