This (last message) seems to be the answer as to why initially I couldn't find William and Violet in the 1911 census. Violet was named at birth and bapt as Isabella, and William was known as John, if this is the right couple, following?
1911 Household transcript:
Name Relation Condition/Yrs married Se x Age BirthYear Occupation Where Born
CORRIN, John Head Married M 33 1878 Farmer Isle of Man Arbory
CORRIN, Isabella Wife Married 8 years F 28 1883 Isle of Man Patrick
CORRIN, Harford Son M 6 1905 Isle of Man Patrick
CORRIN, Hartwell Son M 1 1910 Isle of Man Patrick
CORRIN, Annie Daughter F 7 1904 Isle of Man Patrick
CORRIN, Eunice Daughter F 4 1907 Isle of Man Patrick
CORRIN, Edna Daughter F 3 1908 Isle of Man Patrick
DAVIS, Thomas Servant Single M 18 1893 Horseman On Farm Isle of Man Malew DAVIS, Thomas Servant Single M 16 1895 Cowmanman On Farm Isle of Man Onchan
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RG number:RG14 Piece:34732 Reference:RG14PN34732 RD635 SD1 ED1/1 SN13
Registration District:Isle of Man, Enumeration District:1/1 Parish:Patrick
Address: Creggan Moar Dalby Patrick County:Isle of Man
His parents William & Annie were also tricky to find. Did Annie die soon after last child Walter's birth? BL's burials index has: CORRIN, Ann 30 Arbory 28 Sep 1882.
And this is only a guess, but could this be his marriage [2]?
CARRIN, William 10 Nov 1887 C mal 53 KINVIG, Elizabeth
The guess based on the 1891 census:
CORRIN, William Head Married M 42 1849 Farmer Isle of Man
CORRIN, Elizabeth Wife Married F 38 1853 Isle of Man
CORRIN, John Son M 13 1878 Scholar Isle of Man
CORRIN, Walter Son M 9 1882 Scholar Isle of Man
CORRIN, William Son M 3 1888 Isle of Man
CORRIN, Stanley Son M 1 1890 Isle of Man
CURRY, Margaret Boarder Widow F 70 1821 Isle of Man
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RG number:RG12 Piece:4690 Folio:127 Page:2
Registration District:Isle of Man Sub District:I Enumeration District:
6 Ecclesiastical Parish:St Lupus
Civil Parish:Malew Municipal Borough:
Address:Ballakewin, Peel And Castletown Road, Malew, Derby Haven County:Isle of Man
Walter bapt 28 June 1882 Colby Arbory
William CORRIN born 26 Oct.1888 Mal William CORRIN, Elizabeth KINVIG
? Thomas Stanley CARRINE 13 Jan 1890 Mal William CARRINE, Elizabeth KINVIG
Sue