My father was your grandmother's younger brother, Cornelis, born 1/12/1920. I have some publication (in Dutch) about the family tree of that side of your family. I am happy to Email it to you, and maybe you can give me information about this Australian part of the family. ANother sister of your grandmother (Gre) must have emigrated from Holland around the same year (1953) when your grandparents left.
Judith Siemers-Schermer
Wisconsin USA
judysiem@yahoo.com