This photo, actually a post card, is of the Cheney family of Lima MT taken in 1912 (as the postmark indicates).
Based on the approximate ages of the people represented in this photo the following names are associated with them.

From left to right:
Willy Tuttle Cheney   age 43 - Dottie Holly Cheney  age 14 Leila Ann Wilcox Cheney age 42 - Sylvan Hart Cheney
age (possibly) 18 Unknown - Unknown male child in front - unknown male Bonnie Dee Cheney (possibly) age 3 -
Unknown (possibly this is Sylvan Hart Cheney)

Lima, Montana

Back of Postcard