Hi
Well we now have one of the other children's birth details. So I am looking into Mr Hamblen the wine merchant. Possibly the father of your Henry born 1872, as well as the one born in 1868?
Jacob left a will
Probate Calendar, 1874
16 November
Jacob Henry Hamblen
Formerly of 16 Albion Villas, Albion Road, Dalston, Middlesex, Merchant
Late of 2 Manchester Street, Grays Inn Lane, Merchant's clerk
Died 16 August at 2 Manchester Street
Proved at the Principal Registry by Julia Hamblen of 14 Gloucester Road Regent's Park, Widow the Relict, the sole Executrix