“Människor som sitter i en trädgård” (people sitting in a garden), Lysekil, Sweden, ca. 1890, a cyanotype by Carl Curman, via Swedish National Heritage Board Commons on flickr.
Carl Curman was a physician, specializing in the science of health baths (balneology). He also became a prominent amateur photographer, leaving behind a collection of about 700 photos. He lived with his wife, Calla (possibly the first person on the left above), and their children in Stockholm and, during the summers, in the seaside town of Lyskil.
The group above may be in an outdoor cafe of the park in Lyskil, rather than in a private garden. The spot looks very much like the one in this photo by Curman.