Photo of my mother and her younger sister at the even of their cousin's wedding in 1937

Question

The terrible trio pictured here, looking all sweet and innocent, in 1937. On the left is Anne Hibbert, due to become my mother in 11 years time from this picture, and on the right her younger sister Margerie Hibbert.

The photo taken in St. Albans, Herfordshire England in 1937, and bride in the center Anne & Margerie's cousin Helen, about to marry her fireman Ernest, not in this picture. It was to be a long and happy marriage.