This is the family on the 1911 Household transcription from Findmypast:

Name Relation Condition/Yrs married Se x Age BirthYear Occupation Where Born
GICK, John Head Widower M 61 1850 Retired Inspector Of Engine Fitter, Inchmore Dublin
GICK, Francis Joseph Son Single M 28 1883 Asst Draughtsman Cm Dept Stoke Devonport
GICK, Elizabeth Daughter Single F 24 1887 Cert Teacher R C School Stoke Devonport
GICK, Marian Daughter Single F 22 1889 Cert Teacher R C School Stoke Devonport
GICK, Aileen Teresa Daughter Single F 18 1893 Mothers Housekeeper Stoke Devonport
RG number:RG14 Piece:12969 Reference:RG14PN12969 RG78PN748 RD276 SD2 ED11 SN400
Registration District:Plymouth Sub District:Plymouth South East
Enumeration District:11 Parish:Plymouth
Address:
25 Pentyre Terrace Plymouth, County:Devonshire

This was their 1901 census entry:
GICK, John Head Married M 51 1850 Inspector Of Fitters Ireland
GICK, Emma Wife Married F 45 1856 Ireland
GICK, Mary Daughter Single F 22 1879 Drapers Assistant Devonport Devonshire
GICK, Francis Son Single M 18 1883 Shipwright Apprentice Devonport Devonshire
GICK, Elizabeth Daughter Single F 14 1887 Devonport Devonshire
GICK, Marion Daughter Single F 12 1889 Devonport Devonshire
GICK, Winifred Daughter Single F 10 1891 Devonport Devonshire
GICK, Aileen Daughter Single F 8 1893 Devonport Devonshire
Piece:2109 Folio: 122 Page:25
Registration District:Stoke-Damerel
Civil Parish:Devonport Municipal Borough:
Address:
18, Park Street, Devonport, County:Devonshire

Civil Registration Death:
Name: GICK, Anna
Registration district: Plymouth
County: Devon
Year of registration: 1908
Quarter of registration: Jul-Aug-Sep
Age at death:54
Volume no: 5B
Page no: 142

If you have their marriage certificate in Devon it must show you both fathers' names and occupations?

Sue