Lots of family bands around the South (the ones with which I am most familiar are old-time, bluegrass, and Cajun) but not many that perform at the national level or in a "high profile" commerical context as the Carters did. I sort of get the feeling that anyone looking to start out these days has to streamline things into the most marketable channel as fast as possible, which may not always be compatible with family interests (my family would be hard to sell--we're not cool, we're not pretty, we can't sing like Emmylou Harris, and we all have the same eccentricities).