I don't really know if I can be of any help to you , but I will give you the information that I have.
I had two uncles that married two sisters by the name of Maunders, they were born in Plymouth Devon, Beatrice Born 1891 & Lily born 1889 Their Father William born in Bodmin Cornwall 1868 wife Jane born Plymouth 1868 Married 1888,
all dates approximate Lily M. Married James D. Smith O-D 1913 West Ham,Essex, Beatrice M. married Edward C. Smith O-D 1914 West Ham, Essex they had a daughter Beatrice L.T. Smith born O-D 1919 and I am afraid that is about all I have, you would be able to go back further I think on the Census what I know is on 1901 census.
If you get any problems, feel free to get in touch, I will help in any way I can, I know the feeling of not finding what you want.