I found out who I am looking for. Apparently the street name was Wooldridge in his time, not 3rd St as it is now.
His name is Edwin Francis Wagner, DDS. His wife was Nella Mae Cowing and his mother was Augusta Wagner. I am wondering if anyone might have some old family photographs of these people? I found a poor quality photo of Edwin in the Stewartville Story but would like something better so that I can place a photo of him, alongside his story, framed in the home.
Also, if you know anyone who may have old photographs of the home or even floorplans, it would be my dream to be able to see them! I want to restore parts of the home and would love to see some original photos and plans.