Can I offer an amusing example, from the 1881 census, of why one cannot always trust written and computerised records? But perhaps there is a perfectly logical explanation!

James McMenemy (still looking for the birth of my GGF, John James Boyde of Ballaugh, born 1850-1875, and it's only a tiny island)!

Dwelling: 6 Hanover St
Census Place: Onchan, Isle of Man, England
Source: FHL Film 1342346 PRO Ref RG11 Piece 5603 Folio 82 Page 9

Marr Age Sex Birthplace
George BOYD M 26 M Malew, Isle of Man, England

Rel: Head

Occ: Fireman
Emma J. BOYD M 27 F Douglas, Isle of Man, England

Rel: Wife

Occ: Fireman Wife
William J. BOYD U 3 M Douglas, Isle of Man, England

Rel: Son

Occ: ((Blacksmith))
Joseph H. BOYD U 1 M Douglas, Isle of Man, England

Rel: Son

Occ: ((Blacksmith Wife))