Did you know there was a second marriage for Gladys?
From another forum "My greatgrandmother, Gladys Gray, married a George Grgich in Western Australia in 1941, it was her second marriage. This is the last record I have of her. My granmother saw her around 1944 and nobody seems to know what happened after that. I am starting to wonder if George went back to Yugoslavia (I think that is where he was from) taking Gladys with him as I can't find any record of her in Australia, although some parts of Australia are harder to get records to search. She would have been 39 when she re-married so there won't be many children, if any."