The Dixie Chicks’ brood just got a little bigger. Emily Erwin of the Texas-born country music group married fellow Texan and musician Charlie Robison on Saturday at a ranch in Dallas. They made the wedding a Texas family-and-friends event rather than a Nashville extravaganza and did the planning themselves, said Martie Seidel, Erwin’s sister and fellow Dixie Chick. “Emily’s such a perfectionist,” Seidel said. “It was out in this big courtyard. It was beautiful.” The group’s members sang “Cowboy, Take Me Away” at the wedding.