The mystery of the disappearance of a four-year-old in the South Australian outback has deepened, after it was claimed that the boy's father moved out of the family home following a clash with his child's transgender grandparent. August 'Gus' Lamont vanished almost two weeks ago after playing in the yard of remote Oak Park homestead in the harsh South Australian outback, nearly 200 miles north of Adelaide.Huge air and land searches have failed to find any trace of him apart from a single footprint in the desert scrub since he disappeared on the evening of September 27. Gus is understood to have been living at his grandparents' homestead with his mother Jess and his one-year-old brother Ronnie.Gus's father, Joshua Lamont, lives two hours' drive away, 100km to the west in Belalie North, near Jamestown.The Daily Mail has been told that while Josh and Jess remained a couple, he does not live on the station because of family clashes with Jess's transgender parent, Josie. Joshua was spotted publicly for the first time since his son's vanishing, seen in Adelaide, where he is staying with relatives, after he earlier joined the search for his son. His brother Samuel insisted Mr Lamont - who was once a country music singer performing in SA pubs under the name, Billy Tea - was in 'no state to talk to anyone'.Mr Lamont was seen wearing a sweater emblazoned with the words A Red Dawn - a metal band which he played bass for in the early 2000s. Gus is pictured. His father lives two hours' drive away, 100km to the west in Belalie North, near Jamestown The little boy vanished almost two weeks ago after playing in the yard of remote Oak Park homestead in the harsh South Australian outback, 300km north of Adelaide