Sorry I can't help you. All I know about John Robison is the fact that his name showed up in that bible with his birthday. I have spoken with the oldest living descendant of that family and he said that his grandfather Walker became upset and absolutely forbid anyone to speak about the Walker family history whenever the topic came up. I don't know what he was trying to hide, but all the decendants I have run into have all been outstanding families.
As for Ellen Jane I don't recall seeing her in my records, but if I find something I'll leave a post.