Re: ACHESON County Down, 1800s

In your research, have you come across a set of Acheson / Atchison / Atcheson siblings, named Dorothea (Dorothy), Stewart, and David?Dates of birth are 1814, 1827, and 1823 respectively.Their parent names were David and Mabel or Mary.We are trying to find point of origin.All agree Ireland, but where? Thanks.