The logical answer is yes you do, as they are your controllers and processors of the information you receive. Furthermore it matters not whether you are a small family business or a large organization,
The purpose of a certification is to develop a code-of-conduct for your staff to follow, which in return helps them understand the requirements and actions needed in being compliant.
Richard Branson said it best: “Customers come second, employees first. It’s a philosophy that brings unexpected benefits to both the company and its clients.”