I found this family on the 1901 census, which fits the father, but Marian isn't there...
RG13/2102; Folio 157; Page 14
6 Richmond St, PlymouthWilliam J Shepherd - Head - 31 - Mason - b. Plymouth
Emma J Shepherd - Wife - 28 - b. Dartmouth
William J Shepherd - Son - 9 - b. Plymouth
Edgar G S Shepherd - Son - 6 - b. Plymouth
William E H D Shepherd - Son - 1 - b. Plymouth
Samuel Blyth - Brother - 21 - Carter & Contractor - b. Plymouth
2 sons called William? Seems a little odd... Perhaps a second marriage for one or both?
Rambler