How can I stop a former employer from sharing personal information about me and my family with current employees?

I recently left a retail job after 5 years (4 years as manager). A family member worked there before me and shared very personal and biased information with him prior to my employment. He openly shared this secondhand information while I worked for him, but I made it clear that I found it inappropriate and asked him to stop. This lead to us butting heads. The second owner of the company, however, stuck up for me and tried to help. Since amicably leaving the job, he continues to speak about me in a negative light, using information shared with him by a family member of mine whom was also his former employee. Do I have any legal way to stop him from continuing to talk about me in a negative light?