Robert L. Mills III comes from a storied family — he works alongside his father at a business founded more than a century ago. He is the great-great grandson of William J. Mills, who founded the sailmaker Wm. J Mills & Co. in Greenport, back in 1880. “I do a little bit of everything around here,” Mills said. Mills took the long route to his current role. He graduated from college and worked in Manhattan for a few years before deciding to return home to the North Fork.