Hi I have been reading all the posts on the site as my brother-in-law Shaun (who has posted to it previously) and I were recently talking about some of the info contained. Some of these posts are connected and others could be!! The grandfather of Shaun, my husband (Robert)and their 3 other siblings is the Alexander being spoken of who immigrated to Australia from Vladisvostok via Harbin. He recently turned 99, being born in 1910. It seems he could possibly be the brother of the fellow who ended up in Canada, or he could possibly be the orphaned Ukranian brother of someone else's relative ...but we have no proof of these possibilities unfortunately. (Most people who hear the name do say it is Ukranian.) Grandfather does not speak of his past and it took some urging to get him to tell of his 'motherland' around Nicolsk just north of Vladisvostok. The lady who states her daughter-in-law Denise's father was an Alexander in New Guinea is slightly mistaken. This Denise is our cousin and Alexander is also her grandfather. He had 3 sons - Vladimir (Wally)who is Denise's father, Alec (my husband's father) and Nikita. Nikita is named after the grandfather's father in Russia. Wally did live in New Guinea at one time.
I hope this sheds light on a couple of things. Good luck all in the search!