I just found this post. I am a descendant of one of the six children you list there. Well, anyway, the information seems familiar enough. David Madill is my great grandfather. He was born in 1855 and died in 1932, in Shepparton, Victoria. He lived on a farm in Undera (about 30mins from Shepparton, on which my Uncle still lives). He married three times and had about 18 children (not entirely sure on this number). With his third wife, he had my grandfather, who is almost 93 years old. He, and his younger sister are the only remaining children of David Madill and his 3rd wife Abina Maude Lynas.