I don't think so... they didn't move to NZ until the girls were adults... I hadn't heard or read of Patrick Cullen until Rootschat... Myra returned to the family Hotel after Arthur died, which was also around the same time that her brother Charles died leaving a widow & 3 kids, one of whom, Clyde Thomas looks to have inherited the hotel. An engagement notice 26 May 1952 lists Charles Clyde Davidson, eldest son of Mr & Mrs Clyde Davidson of the Sir Walter Scott Hotel, Tambo Crossing.
I'd interpreted Myra returning after Arthur's death as because she had no other means of support & there was also inference that the family had disapproved of their marriage, but perhaps she was helping out her brother & sister-in-law as well....or just a tragic coincidence... one of Charles' obituaries described a long & painful illness... Myra seems like she was a kind & thoughtful person
Eve met her aunt at the family hotel years later when Eve was a young woman, she described her as "tall & slender & pale & haunted looking; but a veritable martinet of a loveable sort"
When Myra first managed the hotel Eve & June would've been around 11 & 10, it sounded like they were very much a part of the hotel scene & Eve was very imaginative. After a few years they all moved to Melbourne where the girls attended High School.
In Eve's semi-autobiographical novel, The Pea-Pickers, where Eve changed their names to Steve & Blue, the two girls worked as seasonal agricultural labourers around Gippsland, dressed in overalls; radical behaviour for young ladies of the 1920's & even when published in the 1940's.
Lucy Frost's novel Wilde Eve is an edited collection of Eve's stories of their time in NZ & is a fascinating read.