Joseph Clyde Ewer (known as Clyde)

I live in Adelaide South Australia.Can anyone help trace the siblings and children of Joseph Clyde Ewer and his wife Mable K. Lawre(a)nce married in 1918 (ref. no 7994/1918) at Rockdale, Sydney New South Wales.Mable is the daughter of my great uncle and aunt, namely William and Ada Lawre(a)nce, who settled in Redfern Sydney about 1912.