Thanks for the replies. I am going to Bendigo next month so will go to the Eaglehawk Historical society.
Sarah Elizabeth and George Yarwood are my great, great grandparents. I come from Alfred, Annie's older brother.They were the two youngest children.
Walter Charles seems to have become William Charles when he was put in care. He lived the rest of his life in Melbourne whereas the rest of the Yarwoods stayed in the country. Alfred became a farmer in the 1890's near Numurkah.
George Collingwood, the stepfather left not long after he married Sarah. Their son, Jonathan was put in care as well until he was about 16.
Sarah had a sister (Anne Hough) in Castlemaine, but there are no records of the two children being there with her family.I have been to the Castlmaine Historical Society
There is another descendent of Annie Yarwood in WA who has an Ancestry tree as well. I have met her.
Hope to hear from you again. You can put a message on my Ancestry tree as I am on it every day.