The Borissow's and Cowper's are both associated with India. The map below show the places I know they spent time in.

Kalimpong - This is where the Borissow sisters Minnie, Florence, and Winifred grew up, at Dr Graham's Home.

Assam - Theo Borissow worked as a tea planter in Upper Assam.

Jamalpore - This is where Douglas George Erskine-Cowper was born.

Lucknow - This is where Minnie Borissow lived, and is buried.

Delhi - The capital of India and one of the places Douglas George Erskine-Cowper worked.