According to the Internet source given below, The Watersons were an English folk group from Hull, Yorkshire and performed mainly traditional songs with little or no accompaniment.
The original members were Norma, Mike, and Elaine known as Lal Waterson, with their cousin John Harrison from Kingston High School. They had a skiffle band in the early 1960s but moved on to playing more traditional material. The group performed with various family members in the line-up until 2009.
Lal Waterson died in 1998 and Mike Waterson died in 2011 at Scarborough, North Yorkshire.

Websites:
	The Watersons	Biography by wikipedia.org.