Find Ancestors

I am trying to find the descendants of William King and Harriet Annie (ne Cook?). They had at least three children that i know of -Sidney ,Albert George and Gladys but crucially i do not yet know where any of this family were born . In the early 1900's they resided at 10 Standard Square in Faversham and this is where William died in 1913 at the age of 57 -making the year of his birth to be 1856? Harriet Annie was remarried to William Heniker and both died in Faversham . Harriet Annie's death was registered by her son Sidney in 1942 and he was residing at 2 Conway Crescent Chadwell Heath -i have not yet traced any other details for Sidney . Gladys married Seaman Beale in 1927 -and was living at 4 Standard Square in Faversham-where my mother Evelyn was born in Dec 1927. Harriet Annie states on her marriage certificate to William Henniker that her father was Joseph Cook deceased -Mariner . However i cannot find a marriage for william King and Harriet Annie Cook and i wonder if she was the second wife of William King or was previously married herself . The 1901 census offers no clues as the house in Standard Square was empty on census night -a real disappointment to me . Any info would be gratefully recieved -ive been trying for very many years to find my mothers relatives as all info died with her in 1973 while i was too young to challenge her !!!!!