Ruth Crawford and baby Dean Alan Crawford

I purchased this photo on Ebay. This may be (seems probable to me) a picture of the wife and son of evangelist Percy Crawford, of whom and of whose family quite a bit of information may be found online.

My first thought was that the father was away at war at the time of his son's birth due to his photo there, and the date. However I couldn't find a reference to Percy's war service in my cursory online searches.