Don’t know how accurate this tree is on family search
William Cobb died 6 June 1885 Hackney London
Mary Jane died 24 March 1928 Hackney
List 7 childrens names (includes Charles William)
https://www.familysearch.org/tree/pedigree/landscape/9D5M-JN6One of the childrens names listed is Albert Herbert Cobb b1882
GRO indexes confirm mmn
COBBE, ALBERT HERBERT
mmn TERRYGRO Reference: 1882 J Quarter in PORTSEA ISLAND Volume 02B Page 502
And another listed
COBB, MABEL ALICE
mmn TERRYGRO Reference: 1884 J Quarter in BOSTON Volume 07A Page 448
her baptism is on F M P Lincolnshire baptisms, confirms parents names
Mabel Alice Cobb
Baptism 08 Jun 1884 Boston, St Botolph
Father William , labourer Mother Mary Jane
Looks as if Mary Jane has remarried - one of the witnesses to her 1869 marriage to William Cobb was C Colbourne
1891 Market Street, Northampton
Charles Colbourne Head 1850 Boot laster Northampton
Mary J Colbourne Wife 1852 - Edinburgh, Scotland
Mary J Cobb Stepdaughter 1876 Boot fitter Bengal, East Indies
Maud Cobb Stepdaughter 1876 Boot machinist Bengal, East Indies
Beatrice Cobb Stepdaughter 1878 Boot fitter Bengal, East Indies
Agnes Cobb Stepdaughter 1881 Bengal
Albert Cobb Stepson 1882 - Portsmouth, Hampshire
Mabel Cobb Stepdaughter 1885 - Boston
1901 34, Stevens Avenue Hackney
Charles Colbourne 1850 Boot trade laster Northamptonshire
Mary Colbourne Wife 1851 Ireland
Agnes Cobbe Step daughter 1881 Boot trade (paste fitter) India
Albert Cobbe Step son 1883 Tea warehouse porter Portsmouth, Hampshire
Mabel Cobbe Step daughter 1885 Stationary warehouse porter
1911 Mary’s pob Monaghan living Low Leyton, West Ham, London & Essex
added - 1911c
https://www.familysearch.org/ark:/61903/1:1:XWF6-ZVBmarried 22 years
This is the only Colbourne/Cobb marriage I can see on FreeBMD but her middle name is Ann
Sep 1888 Hackney 1b 754
Cobb Mary Ann
Other names on name page
Colbourne Charles
Sanders Mary Ellen
Trigg Thomas James