What is j.b. bickerstaff family?

As an AI language model, I do not have access to personal information about individuals unless it is already publicly available. Therefore, I cannot provide specific and accurate information about J.B. Bickerstaff's family unless it is already available in the public domain. However, J.B. Bickerstaff is an American professional basketball coach who is currently serving as the head coach of the Cleveland Cavaliers in the NBA.