Hi Kermie62,
Your extra information is helpful to us all, thank you.
There are other pieces of information which would help.
Where did Joy L. go to school?
The marriage for Joy was 1936 and she states age 18. This is a birth year of
1918.
That would place her birth inside May B's marriage to MOULE.
What date each year did her family celebrate Joy's birthday?
As May B. was living in Melbourne and suburbs in 1914 and 1918, according to the electoral roll, a birth for Joy would probably not be rural.
Who were May B.'s siblings? Were there unmarried sisters of child bearing age in 1916 to 1918?
On the death certificates of May B. or either of her partners, what is stated about "issue of the marriages"?
What age is recorded for Joy L. at death?
Perhaps some of these questions have already been addressed in the thread, but with the confusion over who is OP and who is ",assistant OP"I may have missed them

Sue