Monty,
I see a lot of Tatume in those pictures. It was the mother so there maybe something to the DNA that comes solely from the mother. The dark green vines and ability to climb are much like Tatume. The leaf shape while isn't exactly like Tatume, it has deep leaf notches, which Tatume does, especially compared to Lemon. You can see a few pictures of Tatume on the 1st page of this post (first picture here is a good zoom out of Tatume plants
http://www.tomatoville.com/showpost....53&postcount=9 ).
The fruit definitely look more like Lemon, in shape, size, and color.
I've got a few F1s along with 1 plant of Tatume and Lemon growing this year.
Justin