Hi Craig, I got your post. I am positive that my grandmother, Priscilla, only had the two sisters, I visited often with my grandmothers' sister Dorothy and her husband Joe in the mid 1970's at there home in Mount Waverly (Victoria), which is where their fathers farm was located. Her married name was KEDDIE. They had only one daughter, who they named after my grandmother's other sister Pearl. ( She was refered to as "Young Pearl")
My grandmother's other sister was Pearl(AMES)and she went blind and was in care when she got old. I never got to meet her as an adult, only as a young child and I have only vague memories of her. I do not remember her husband Bazil at all. Their son, Stamford, was very close to my father Harry BICK (first cousins),and whenever Harry came to visit and spend time with his two grand-daughters (my children)in Brisbane (Queensland),he would always go back to his home in Perth (Western Australia), via Melbourne (Victoria) and stay with Stamford and his wife Wylie for a week or two. I had a telephone conversation with Stamford's son Alan AMES last year. He is a plumber in Melbourne.
Perhaps the other siblings? you refer to died at a young age, or are perhaps cousins of the three sisters.
If you are on SKYPE I am BICKGML Brisbane Australia. Cheers