Hi
Are you sure that he was born on Guernsey as I have a 'maybe' match on Jersey?
1871 Census
RG10 Piece 5757 Folio 53 Page 14
20 Charles Street, Cottage, St Helier, Jersey
Nathalie Le Blond Head 53 Market Woman b France
Thomas C Le Breton Boarder Marr 33 Carter b Jersey, Trinity
Marie Le Breton Boarders Wife Marr 34 b France
THOMAS P LE BRETON Boarders Son 6 b St Helier
George H Le Breton Boarders Son 5 b St Helier
Amelie M Le Breton Boarders Daur 3mths b St Helier.
Do you think this could be him?
Anne