Hi Lorri
Yes, I sort of got the feeling earlier on in this thread, that Georgiana (Georgina) and Frederick probably had no grandchildren, and I think now that that has been confirmed in Georgina's death notice. Rather sad.

[I do feel sure that they would have been mentioned in the notice had there been any. Also, as deceased son Cyril had been named, I think had there been another child of the couple, then that too would probably have been noted ? ]
As to the photo (photos) you have, (and a real shame that they're not labelled in anyway

), it's possible that the fourth child (or the other girl) is a neighbour or playmate of the MARTIN siblings ??
Have more to add here for Frederick ... see following posts.

~ Lu