I purchased this photo at a local antique store (Eugene, OR) of two Baird sisters and an unknown person. The sisters are
Sarah "Sadie" Winifred and Mildred Baird.
The daughters are the children of Archibald Murchland Baird and Mary Josephine Lyons. The family moved around from Scotland, Illinois, Kansas, etc. Sarah married Fred Partridge, and there are a bunch of other Partridge photos from this branch of the family if you are interested.