The Bolter, aka Nana Dorothy was an artistic type, bohemian even. I would assume she had some gay acquaintances. The lad on the far right I believe is her brother and seems to be pulling back a bit from the open affection with which the others are engaged. He was either married at the time or not too long after. The photo was taken at Luna Park, I suppose Melbourne's. What do you think? Are they a bunch of screamers? I'd certainly put my money on the doe eyed boi next to Dorothy's brother.
The lad on the edge of the waterfall does not sit in the most butch pose. He loves his dog though and the gym too by the look of his six pack. Nancy boi? No idea where the falls were. Some photos had adjacent white ink writing and some did not.