Again Robin - your request is too general. Have you looked at censuses, parish registers, birth, marriage or burial records? There are over 900 Devon DANIELS census records showing on FindMyPast for instance (1841-1911). This board is for pointing you in the right direction to find information but without knowing specifically what you already have found it is difficult for us to help. You can tell what records are available by using the DFHS 'surnames' search at
http://www.devonfhs.org.uk/surnames.htm