Yes, thats the family - my grandmother was the youngest, Grace Florence. I do have the marriage certificate for William & Louisa - thats where I obtained Williams parent's first names.
I don't have any documentation linking William Bell & William Titley - just a family story of bigamy, and an absence of a William Bell death in the right era (I searched with the WA registry) and the absence of any WA docs for William Titley prior to his death.
Leigh