I think that 1891 census may be the correct one for John Hamon just checked out sister in law
Louisa J FOSSE her surname is Le Lievre dau of Phillipe Le Lievre - see marriage below
22 May 1887 St Helier, Jersey
Louisa Jane Le Lievre Age: 20 Father: Philippe Le Lievre
Spouse: Auguste Fosse
witnesses to the wedding P & ? HAMON
EditedThomas Charles Hamon born 13 Aug 1881
Baptism 4 Sep 1881 St Clement, Jersey
Father: John Hamon occ journalier
Mother: Marie Le Liévre
occ Journalier translation day labourer
possible marriage
26 Feb 1878 St Clement, Jersey
John Hamon 22
occ marin father Thom occ marin
Mary Le Lievre 21 father Phillippe oc marin
Witnessed by George Elie Hamon & Mary Elizabeth Hamon
occ marin translation
seamanJohn Hamon
occ fisherman, wife Mary son John P
1881c
https://www.familysearch.org/ark:/61903/1:1:Q2WS-PBHSJohn Philip Hamon born 26 May 1879 Baptism 8 Jun 1879 St Clement, Jersey
Father: John Hamon
occ journalier Mother: Marie Le lièvre
for info. on same page as above baptism
George Elie Hamon & Mary Elizabeth Hamon bp 11 May 1879 dau Mary Elizabeth Jane Hamon
John Hamnon born c1853 St Clement Jersey father Thomas/Thom occ fisherman
1861
https://www.familysearch.org/ark:/61903/1:1:M75S-LR81871
https://www.familysearch.org/ark:/61903/1:1:KDXH-CWFJohn Hamon Baptism Date: 29 Apr 1855 St Clement, Jersey
Father: Thomas Hamon occ Mother: Mary Elizabeth Henry
possible marriage
6 Jun 1848 St Clement, Jersey
Thom Hamon 20 occ pecheur father Thomas occ pecheur
Mary Henri 24 father occ Elie Joseph Henri occ pecheur
translation pecheur (fisherman)