Hmm,
The Carter Family (including Carlene)
The McGarrigles (sisters and their progeny)
The McCarters
Shelby Lynne and Allison Moorer
Mary and Frances Black
Doc and Merle Watson
The Wilson brothers had a band that had some success
The Carter Family (including Carlene)
The McGarrigles (sisters and their progeny)
The McCarters
Shelby Lynne and Allison Moorer
Mary and Frances Black
Doc and Merle Watson
The Wilson brothers had a band that had some success