The 1901 Census has:

James Callow 25 Isle Of Man Douglas Isle Of Man Onchan General Labourer

and

Frances Boylin 22 London Marylebone London Kensington Domestic Servant

who seem possible:

JAMES CALLOW - International Genealogical Index
Gender: Male Christening: 25 MAY 1873 Saint Mathews, Douglas, Isle Of Man s/o Wm CALLOW & Eleanor

and from FreeBMD

Births Mar 1879
Boylin Frances Marylebone 1a 561

If this is her; 1881 census has:
John J. BOYLIN Head M Male 41 Corfu Btsh Subject, Greece Plasterer
Frances BOYLIN Wife M Female 34 Dublin, Ireland
Anne BOYLIN Daur Female 16 Marylebone, Middlesex, England Scholar
John BOYLIN Son Male 14 Marylebone, Middlesex, England Scholar
Amelia BOYLIN Daur Female 10 Marylebone, Middlesex, England Scholar
Florence BOYLIN Daur Female 6 Marylebone, Middlesex, England Scholar
Frances BOYLIN Daur Female 2 Marylebone, Middlesex, England

Source Information:
Dwelling 10 Little York P
Census Place London, Middlesex, England
Family History Library Film 1341032
Public Records Office Reference RG11
Piece / Folio 0144 / 99
Page Number 43

All speculative, of course, but worth looking in to.