Hi Bob,
I tried to find the death record for Barbara Deane - living with your g-g-grandfather Arthur in 1901 - but nothing in the whole of Ireland shows up. Maybe the surname was written down wrong? She was 88 years old in 1901, so she must have died by 1911 or thereabouts. John Togher is listed as John Toher in the 1911 census. I also notice a girl named Bridget Sally in 1901, aged 18 years. Nothing at all on her that I can find afterwards! I now suspect she moved to Scotland, alongside so many others in Mayo. Must have a look there, when I get the time. In 1911, alongside John Togher, we have Rose Gaughan aged 23 years. Was she related to the family in which Denis Bingham had a son - Denis Gaughan? I tried finding out, and I can't identify whether this is the case or not.
As to the records for James Kelly and Letitia French St. George, all these are readily available:
https://www.geni.com/people/James-Kelly-43/6000000014035018059. The link I attach does seem to have errors with the dates, however. I saw a post elsewhere that tells us the two children of Henry Michael Bingham Kelly were Louisa Gordon, and Charlotte. They have many descendants of their own now. I think what is clear is that the descendants of Henry Bingham and Letitia Daly were all connected. This is why I think Edward Kelly (born c.1745) is connected to James Kelly, and perhaps to Catherine Kelly who married the mysterious James Bingham (c.1823-1890). The Geraghtys are the other lot who need investigating, but I don't see how we can go much further unless this John Togher's Geraghty family were the same. Indeed, without siblings for Kitty and Bridget, there will be nothing else to go on. Is there no information on Kitty's parents names?
The research is enjoyable in any case, but yes it is a big task to investigate. I find the same with my Barrett ancestors (on the other side of my ancestry) - they all connect somehow, but they are so numerous as to make the exact connections elusive. I did find a famous poet named Richard Barrett, possibly connected, who lived way back in the Rebellion of 1798. He was something of a local hero, and I believe he was friendly with the Major. When he began to support the Rebellion, that friendship dried up! His grave was marked very visibly until a few decades back, and now the sea has claimed it mostly, as it was on the coast. He is said to have been the "Last Bard" of Ireland - going back to the 1500s, we find that it was a professional occupation.
https://www.duchas.ie/en/cbes/4428004/4367024/4465626All the Best! Amac1210