Hi
It doesn't look as if William decided on Friese-Greene until after his first wife's death. He and his second wife and two sons can be found using that surname in Dovercourt Essex on the 1901 census.
1891 census RG12 5 folio 11
9 Bristol Gardens Paddington
William E Green 35 Head Married Artist Bristol
Lena Green 37 Wife Married Switzerland
Ethel Green 14 Daughter Bath
Eda Friese 36 Sister-in-law Single Living on own means Switzerland
Clara Friese 34 Sister-in-law Single Living on own means Switzerland
Births Jun 1876 GREEN Ethel Adelaide Bath 5c 684
6th January 1897 All Saints, Fulham
Forrester Seely Barnes 22 Bachelor 223 New Kings Road Parsons Green John Forseter Barnes Pianoforte maker
Ethel Adelaide Steele Greene 20 Spinster 223 New Kings Road Parsons Green William Edward Greene Photographer
Both signed
Witnesses William Edward Greene and Charlotte Barnes
1901 census RG13 1214 folio 130
43 Hazeldean Road Willesden
Forrester Barnes 25 Head Married Photographer Kentish Town London
Ethel Barnes 24 Wife Married Bath Somerset
William Barnes 3 Son Chelsea London
Harold Barnes 2 Son Chelsea London
Percy Barnes 19 Brother Photographer Marylebone London
Ethel and Forrester with an ever growing family are in Essex on the 1911 census (free search)
In 1917 when their son William Edward Barnes was killed in the First World War, Ethel and Forrester were of 117 Southview Drive Westcliff on Sea
Forrester S Barnes died aged 73 in Southend on Sea in 1948
It isn't easy to find a burial in London. The guide on the London and Middlesex board lists all the cemeteries and the who administers and keeps the records
http://www.rootschat.com/forum/index.php/topic,403485.0.htmlRegards
Valda