Adam, another from the Argus dated 19th October 1916. Only brief: http://newspapers.nl...c...m="sparkes"
Regarding Dulmen, Westphalia POW Camps, maybe something of interest/relevant here: http://1914-1918.inv...showtopic=75109 http://www.1914-1918...andad/camps.htm
AWM collections search type Dulmen and you'll get quite a few images. Here's an example of one:
Corfields book available here: http://shop.abc.net....roductid=548653
Given the Sparkes family were well known in Foster perhaps the local historical society may have something? Here:
The Foster and District Historical Society Inc.,
PO Box 231, FOSTER, 3960. http://www.promaccom.../foster/Museum/
"From palings to pavements : a history of Foster 1870-1995, in three parts" / [written by H. C. Wilson, Rupe Cunningham and Geoff Esler ; compiled by Geoff Esler and Brendon Baker]
Publisher/Date: [Foster, Vic. : South Gippsland Pub., 1995?]
On page 16 of this publication there is an image of Valentines father and mother outside their home "Rose Cottage". The society no doubt has a copy of this publication? Unfortunately there is nothing relating to WW1 in it.