Elsie Joy Muntz an experienced pilot later Mrs. Davidson was killed in WW2 and her sister Isabelle Hope Muntz lived with her half sister at Apple Tree Cottage in the village of Chaldon Herring together with Andre Bonnamy (1898-1979).
When Isabelle died in 1981 her friend Catherine Morton bequeathed their collection to the County Museum Dorchester tel 01305262735, so they may be able to help you.
Somewhere I have Minnie Isabelle memoirs and I will try to find them, also photos of the sisters in Toronto.