Mystery Monday - Unidentified Wichers

This is a picture that my grandma has. It should be from Kansas, and most likely of some Wichers children. There were no names on the back, and everyone I've asked can't figure out who these children are. I think possibly it is from the late teens, early 20s based on the car. The older girl sitting down could be my great grandma Grace Gertrude Wichers. If it's her, the other children may be a mixture of her brothers and sisters and cousins.

I just like the look of it, with the barn and the old car and the horse drawn buggy in the background. I just wish I could figure out who these kids are. And also the people in the background.