Question: what questions to ask a personal reference?
Answer: How Are You Related to the Candidate? ... 
How Long Have You Known the Candidate? ... 
What Are His/Her Weaknesses? ... 
Would You Trust the Candidate with Large Sums of Money, Children, or Fragile Individuals? ... 
How Does the Candidate Relate to Others? ... 
How Did the Candidate React to Stressful Situations? ... 
Would You Hire the Candidate?