My boss is also the owner of the company and during the 11 months I have worked with him I have never had to do any personal errands for him.  He very much keeps his personal and business lifes separate, and vary rarely does he talk about his personal life in the office either.  It seems to work well.  At the end of the day he has me to assist him with work, and at home he has his wife and family.

Coz