Mackenzie Caroline Paterson John Arthur Jacqueline IN Australia

Can anyone help me find my cousins Caroline Paterson MacKenzie B. 1938 Edinburgh, Jaqueline MacKenzie b. 1940 Paisley, and John Arthur MacKenzie b. 1942 Turriff Scotland. They emigrated to Australia in 1948 on ss Maloja with their parents John Arthur MacKenzie b. 1905 Dundee, and Dorothy (Nee MacLeod) b. 1921 aberdeen. I have tracked Caroline to 1957 when she joined australian Navy, then nothing. Their father died in 1987 in australia, but had become estranged from his family. We knew nothing about these cousins till 12 months ago as our Unlce OMITTED to tell us........ and them I pressume. My e mail is davinabroster@gmail.com and I would be very grateful of any help.