Maeri,
Thank you for your information re the death certificates. Alexander and Benjamin did die in Fiji and although I have now obtained death dates (thanks to descendants I have located in Australia), I have had no luck with the other children of Robert. As far as I know, there is a Registry in Tarawa, Kiribati, but it is very difficult to find an address to write to and even then, I am not sure how helpful they would be. They have probably never been asked for this information in the past! I would also like to know which of Robert's children from his second marriage were the ones who drowned with him in 1915.
Cheers
Dunscore