The gal on the right, I am thinking, is the daughter. Her dress is very simple and plain except for her initials on the front. I love monogramed items like this, so personalized and so very period too. Honestly, I think personalized items like clothing are vastly underrepresented. Her dress has a squared shoulder so I am guessing there may be shoulder pads there too. Her leg wear is a plain shoe and a thicker stocking like her mother's. Like her mother, her look appears to be fashionable but not high fashion.
Hair, here, we have two different hair styles. On the right, her hair is worn down, curled, and is swept away from the face. On the left, her hair is up and secured into what I think may be a bun the back of head.
As a final note, this photo was taken with snow on the ground. It must have been chilly but the ladies are not wearing sweaters of any kind. It is possible these dresses may be their winter attire given the background.