Kitty is on the far right above the man and she is wearing a brooch at her neck.
Kitty at the seaside. Unfortunately no clue as to where this might be. But I think we can see WWII beach defences (see next picture) in the sand behind her which places the date at round 1939 or a few years either side
WWII beach defences
Kitty was born in 1910 so the hand-written date on this photo (1940) would show she is 30 when it was taken