During which period Dame Mary Ethel Hughes GBE's husband hold the responsibility of administering the Department of the Prime Minister and Cabinet?
Mary Hughes: Dame Mary Ethel Hughes GBE (née Campbell; 6 June 18742 April 1958) was the second wife of Billy Hughes, Prime Minister of Australia from 1915 to 1923. Prime Minister of Australia: The Prime Minister of the Commonwealth of Australia is the head of government of Australia. Prime Minister of Australia:  The Prime Minister also has the responsibility of administering the Department of the Prime Minister and Cabinet.
i don't know