Still Looking for Jimmy William Robertson

jimmy was born about 1939 and died about 2011 i believe he was living in queensland at the time location unknown. i was told he was possibly cremated at eagleby qld his wife was joyce and they had four children their names were ricky, trudy, linda, and samantha. ricky was born about 1971-1972 their where abouts are unknown
hope some one can help with information thank you