Find Ancestors

i am trying to find any information on my paternal grand parents Alexander Macrae Mackay and his wife Fanny (nee davies or davis) i know my grandfather was working as a windmill repair man in the bush in western australia and i know that my grandmother had at least two sisters one of them I know was name Jessie she lived in south fremantle and my grandparents lived in mosman park western australia. they had three sons, one my father kenneth george, another Alexander Macrae, who was a prosecutor at the war crimes trials in the phillipines after the second world war, he married very late in life and had no children, and the third john (known as jack) who had two sons john, and graeme, he ran hotels in the Kalgoorlie, Port hedland and leonara area of western australia. I have a family bible that has some fairly illegible notations but it was from the strathaire region of scotland. any help would be much appreciated