Nice find. Solidifies that Esther's maiden name was Carter, and almost certainly the daughter of John Carter and Elizabeth Bell. I have from a Carter researcher that two of the children of John and Elizabeth were born in Glen Boyne, Ireland. However, I cannot find any such place, but it may be Glenbarrow which is a townland SW of Rosenallis, Co Laois.
I'm not aware of any archives/historical societies in Co Laois. There is a Church of Ireland in Rosenallis where the Bell's went, however, the parish registers (available at the Archives) only stated ca 1800. You may find some baptisms of their oldest children if they stayed in the area before going to Ontario.
I do live in Ontario (Ottawa). Who is the reunion for, Sothern's?