Hi Dragon,
The suggested purchase of the marriage certificate will give some information about the couple.
However, I would bear in mind they are costly at nearly $50 Aust and unfortunately, the very bits of information you are seeking, may not be shown. Some certification requirements did not come into place until some years after the marriage dates of your people in W A
You will see-
Date
Couple's names
Couple's ages
Couple's birthplaces No
Previous status
Couple's occupations
Couple's residences
Fathers' names
Fathers' occupations
Groom's mothers name No
Bride's mothers name No
Sue