Hi Ken,
From the earlier photo, it seems the family were fond of Levis motorcycles. I'm pretty sure this is another, even though I don't recognise the tank transfer as Levis. (Perhaps you can look at it with a bright light and magnifying glass.) I'd guess early rather than late 1930s. Again at this date Levis were a well-rated brand of two strokes, and even a well-off family could choose a machine like this if it met their needs. Levis had a range of four strokes by this date, but the flagship of the two strokes was the "Six Port", which was quite a potent machine. Not much to be seen of the engine here other than the outside flywheel - over to you Levis experts!
Leon