It would appear that my grandfather; Walter Robert Lane born of William Bury Lane & Elizabeth Bragg on 27/11/1898 is a sibling of your G G Grandfather. It also seems he lied about his DOB changing it to 1897 so that he could enlist in the AIF for WW1. He fought on the western front, returned home in 1919 and later married my grandmother. He also volunteered for WW2 and survived, having served in New Guinea etc. He died in 1961. I was born in 1952, so my recollections of him are very limited.