Karen, yes your offer of assistance is most welcome. In my own research Dunsany figures prominently. While my searches into the Steers side came to a brickwall with John Steers, his wife Catherine is very different. Her maiden name is Henry and I got hold of her birth details which show a Laurence Henry b.1792 Dunsany as her father, her mother was Eleanor Maguire. John and Catherine's son, my great-grandfather, was Laurence (Steers) and my father's name was also Laurence. Laurence Henry's father was Mathew Henry and his mother Caherine Brady.
I would very much like to get in contact with the Preston family as they may, as you say, posses some information. Perhaps you could assist here.
Karen, I am happy to pass you my email address if moving such conversations there proves easier etc. Just let me know.
Dask