OK Gortinanima,
I'm trying not to get too excited as I really want to believe what you're saying. Yes, I know that Matilda, the daughter of James Beatty of Aghavoory married William Robinson. Yes, she was witness to her father's death, but (presumably according to the information Matilda Robinson provided) he died in 1873, aged 76, so would have been born in 1797. His death cert is on my blog (link below). Where did you get 1880 as his death? DOB 1797 doesn't quite fit with other sources known to descendants of the Farnamullan Beattys, who have James Beatty, their second son according to the order of Archibald's children, born c1807, despite his parents having married in 1792. Wouldn't you think that 1797 was the perfect date for the birth of a second son born to them?? Anyway, he was obviously still alive when his brother Archibald died in 1869, and only got a token amount in his younger brother's will. I'd like to think that's because James, the eldest surviving son was very well set up - at Aghavoory!
Please keep thinking! This could link two lineages in the Beatty project!