This vintage real photo postcard features an image that encourages conjecture. Therefore, I will conjecture. I believe that the photograph presents a mother and daughter (they display a family resemblance) posing outside their front door just past their wood porch. Mom is sitting on a chair and her daughter affectionately rests her right hand on her mother’s shoulder. Note that the daughter is standing on and the mother is sitting on a pretty rug. They apparently brought the rug from inside the house for the purpose of being used in the photograph. Judging by the pair’s clothing, I believe that they are Mennonites. The stamp box on the reverse of the postcard indicates that it is printed on AZO paper which was issued between 1904 and 1918. (SOLD)
THE CABINET CARD GALLERY 
I concur.
To me the seated woman looks younger, also married ‘plain’ women are more likely to wear dark dresses. Those are flirty bows to the bonnets, vanity-vanity!