Older couple probably related to Annie Louisa Barrs

The first four of these photos were taken on 17th March 1939 at Darling Habour Wharf. Clearly the older couple are leaving on a ship.
Checking the Newspapers of the time, the only real candidate for the ship is the Awatea which was a steam ship (cruise ship) which travelled between New Zealand and Australia.
The last photo was taken in England.
My guess is this couple are the grandparents of Annie Louisa Barrs who came to visit on a holiday and took a cruise to New Zealand. The problem is I don't know which set of grandparents. Any help is appreciated.