Thanks Trish and Jool. We may not have found a blood link between them, but obviously there was a social link to the Moon and Brown families. Yet again, I'm convinced that the person holding the camera was Dorothy Clifton Brown.
So that just leaves photo No. 1 and No. 5, (assuming that is Arthur and Edith Moon in Nos. 7 and 8. It would be great to be able to confirm this with another photo, but on the surface of things, it does seem likely it is them.)
How amazing is it that several mansions and now two families have been identified. Bl**dy marvellous!

Caz