People who keep telling your business to everyone.?

Okay this is the deal, some guy at the gym that I go to was telling me about this neighbor he live next to that come to find out worked with my father. Now the place that my dad worked at, he had a very high position. Every time the guy at the gym talks to someone who worked in that field he has to put my father’s name in the conversation like he knows my dad. Just the other day some guy was talking about applying in the same field as what my dad worked in for over thirty years, this guy at the gym tells the guy applying that my father worked there, his high position, and everything like that’s his business to tell. I don’t know these people at the gym like that I talk about sports, working out, and whatever else we might talk about. It’s like he can’t keep is damn mouth shut if I want someone to know my personal or family business I should be the one to tell them not him. I’m trying to be nice because this guy is up in age (60’s) but he tells everything like a gossiping *****. I don’t want to hurt his feelings but something has to be done next time he puts my dad’s business out there, any advice on how I should go about this matter.