Hi Robert, Looking at the BDMS, Bluebell and Primrose b. 1916 (twins?) are two of the daughters, and I thought Lily (1910) and Daisy (1905), only because of the names, but I see you have Winifred in your tree and that would be too many daughters. After 1911 the mother's surname is given on the indexes and only the two girls in 1916 come up. So logically speaking, all the other children should be there on the 1911 census. I have only looked at the index, but you can check the original for a small fee at
http://www.1911census.co.uk/search/tnaform.aspx. Jacklin boys listed that are younger than Arthur are Horace, Sidney, Ernest,and William. I had a look at outward passengers from England to Australia
http://www.ancestorsonboard.com/ and there was a William Jacklin who emigrated in 1923 to Melbourne on the ship "Borda".
http://proarchives.imagineering.com.au/index_search.asp?sear... I then had a look at the Electoral Rolls for Victoria and found a William Jacklin listed 1930/1936 who was a soldier, but from his service records he was born in Scotland. There are a couple of others in Qld and NSW, but if you check the 1911 census, you can at least get a possible name to work from.
I know it is just a name, but also possibly of interest re connected families is a William Amos Jacklin, a carpenter living at Kingsthorpe, Oakey, Darling Downs in Queensland in 1925 with Violetta May Jacklin. In 1936 he was a farmer at Evergreen, Jondaryan, Maranoa. These places are west of Brisbane. This William Jacklin married Violetta May Neave in Queensland in 1914 and he was born in Bingera New South Wales in 1890 to John and Mary. This is from his service records at
http://naa12.naa.gov.au/scripts/ItemDetail.asp?M=0&B=736...Good luck
Debra