Bigger Families; Faces From the Past

I love this picture of a family with great big smiles!  I wonder whether this is their farm and their horse, or maybe they were city folk who wanted their family picture done on the farm.  I tend to believe the former because a picture on a dude ranch or friend's ranch would probably be with more obviously western clothing accessories and background. Forget the polo shirt!   I bought the picture on Ebay and have no information on the family or where this was found or taken.  Of course, if anyone recognizes them, please let me know!  I'm not familiar with the trees in the background.  Perhaps someone can tell me what they are and they will be a clue to the location. As usual, click on the photo to see it full-size.  It is actually REALLY big so you may need to click on the enlarged picture another time if your browser sizes it to fit the page.