12nat on Family Tree Circles

I'm looking for any information on William Stewart Scott. Born 1879 to william and christina scott nee stewart. He was born in West Derby Lancashire and was one of about 8 children. Brother George and sisters Christina, Jessie and a few others im not sure of their names.
We have been surching for years and are having trouble filling gaps. He was enlissted in ww1 in 1915 in sunderland and we dont know if he survived the war. he never returned to his wife and child in australia but we has recently discovered that he was already married in scotland in 1901 to a Mary Wanless. We cant find out anything on either of their lives, children, deaths etc..Please help.