You're right that, with the family's propensity for invention and reinvention, it is entirely possible that anything found will raise more questions than answers. I suppose I am just curious as to whether John fathered Sarah's children as well as Mary's!
On another tack I went on a hunt for the short-lived child of John & Amy referred to in their 1877 matrimonial proceedings. The reports show that they spent their "married" life at Upton Park, Slough* (Eton reg district at that time) incidentally one of the earliest planned estates according to this:
http://en.wikipedia.org/wiki/Upton,_Slough... & more here including pics:
http://static.slough.gov.uk/downloads/History_leaflet_version_6f_16.5.12_web_version.pdfThe only Davies child who was both born & died in Eton district 1870-77 was this one:
Evelyn Augusta G M Davies
Birth reg Sep qtr 1871 Eton 3a 447
Death reg Dec qtr 1871 Eton 3a 297, aged 0
* Here they are at Upton Park in April 1871, with his mother:
1871 census: RG10/1401/94/66
5 Victoria Terrace, Upton Park, Upton cum Chalvey, Slough
Sarah A E Davies Head W 52 Officer’s widow Kent, nr Rochester
John A S M do Son Mar 28 Lieutenant Royal Artillery East Indies
Amy A J do Niece and daur-in-law Mar 17 Officer’s wife East Indies
Egerton C B Lawford Nephew Unm 16 Student East Indies
Flora M C Lawford Niece Unm 14 Scholar East Indies
...plus a governess and two teenaged female servants.