I have had another thought in relation to your inquiry.
If your Grandmother is Jessie Neil Ismay Mitchell who married George Cameron Taylor, then we are related. They are my Aunt and Uncle and her mother is Ottillie Mathilde Anna Hitzke(my Grandmother).
Hope this is of some help to you.
You are welcome to search my Family Tree, if you like, or alternatively, get back to me for any further information.
I used to holiday with Uncle Cam and Aunt Jes when they lived in Chermside Brisbane.
I await your reply.