The Watersons

The Watersons were called The Guardian "the most famous family in English traditional country music" in 2007. The original family could not read music but learn a variety of songs from their grandmother, which they sang a cappella (in similar fashion perhaps to the Copper Family Singers of Sussex). 

Their membership has changed over the years with several children joining parents and Margaret Waterson's husband Martin Carthy joining the group. One grouping now performs as Waterson-Carthy.

A tribute to Lal Waterson was held in 2007 at Cecil Sharp House. The family has certainly left an indelible stamp on traditional English song.

Discography: https://www.discogs.com/artist/374533-The-Watersons