I am researching the same Weierter family. I am a 3rd cousin once removed to you. Your great grandfather Frederick Weierter married Sarah Holiday Kay in Kircaldy, Scotland. My great great grandmother was Eliza Forgan Kay, Sarah's sister. I am aware of the Weierter family living in NSW. I have also recently been in touch with a Bob Weierter Balluffi in the USA. I am an industrial chemist, aged 43y and live in Melbourne, Australia. We need to talk.