The above photo was taken in 1927, and is the only one we have which features Lucy Knight. It was a gathering of Bishop siblings at the home of Violet Bishop Ramsden, who lived in Castlecrag, a suburb of Sydney. From left to right we have: Olive Bishop Oakley; Violet Bishop Ramsden; Ivy McCallum Robley; Lindsay Grant and his mother Myrtle Bishop Grant; Roland Bishop and his partner Lucy Knight( both photographers from Woollahra).
The bottom photo is Roland and Lucy, cropped from the first photo.