The National Archives Australia passenger index up to 1950 did not name Eric and family. (I did not check for an odd spelling of the surname!)
A YEOWARD surname search though at NAA brought up another son born 1928 in Red Deer, and he joined the Navy in 1946. So the timeframe is from 1928 up to 1940.
Passenger records in other States generally are only up to the 1922 or 1923.
AncestorsOnboard/FindMyPast once had a free index up to 1960 but I have not been able to access it lately. Maybe one needs to logon nowadays.