Charles Isham Caldwell married in 1887 to either Amy Mary A Garlick or Clara Kneebone. (no Charles Isham in censuses)
1891 RG12; Piece: 591; Folio 56; Page 33
Charles 'J' Caldwell b Brighton living with wife Clara and Francis son, living in Croydon, living on own means. Entry above is Richard Kneebone who is a retired Ironmonger.
1881 RG11; Piece: 1365; Folio: 40; Page: 74
possible for Charles
Colwell - son of Alice - she is a widow and he is an apprentice in a factory

Needless to say, I can't find much about this one either

found what may be the family in 1871 but again very ordinary! There are other children so you would wonder why Charles would be singled out. Not sure at all re the 1871 and 1881 but feel confident that 1891 is Charles.