Thank you for the assistance with my Margaret Horan query.
My record indicates Daniel Reidy and Margaret Horan also had a son Daniel Reidy (my great great grandfather), born 1827. I think their children also included a Bridget and a Margaret Reidy.
Daniel, husband of Margaret Horan, was born about 1800. However I don't have any information about Margaret, other than a name. It would be nice to look one generation above her, to see if I can link in to another tree, and explain a DNA match.
It is good to have your confirmation, it does firm up my knowledge to date.
Regards