Mary the mother or Mary the daughter?
There is a Mary Mannion on Ann's marriage as a witness.
Have you looked through the parish register, a lot of it is unreadable, I'm having a go but it's slow when your not sure of the year. She could even be a lot older than we think and born in Ballinasloe.
Where did you get Mary as one of the children?
I was referring to Mary the mother (Harney); I'd like to find something that ties Ann or Elizabeth to her directly as there are a lot of Marys and a lot are married to Patrick Mannions so I can't tell which is mine. Just to confirm, forget about Mary Barrett (yet another Mary) - as noted earlier, that should be addressed separately; I'll start a separate thread eventually.
To recap: my great-grandfather was Michael Mannion/Manning, born around 1866/7 in the Ballinasloe area and he emigrated to the US around 1891. His parents were Patrick Mannion and Mary Harney. Among their children were Michael's siblings: 1) Cecelia/Celia (b. 1867), who moved to the US and married; 2) Katherine (b. 1875), who moved the US and married and indicated that Ballinasloe was her place of birth and her last residence in Ireland was Attymon, Galway; 3) Thomas (b.1870), who I believe died in infancy in Ireland; 4) Mary (b. 1870), who moved the the US and married; 5) Anne (b. 1868) and 6) Elizabeth (b. 1876) - neither of whom appear to have emigrated. In short, there is a Mary Harney (my 2x ggm) and her daughter Mary Mannion (my ggf's sister), but the younger Mary definitely moved to Massachusetts - I have marriage records identifying her parents and Michael and Mary Harney. Daughter Mary said she was 26 at her Massachusetts wedding in 1896, but I found a baptism record for 27 Mar 1866 at Killimore and Tiranascragh, Galway, to "Michl Mannion" and "Mary Horney." Based on emigration dates for my ggf (1891-4), Katherine (1894), Celia (1889), and Mary (1888, according to the 1900 census of someone that fits her profile), children not named Anne or Elizabeth were gone from Ireland by 1889-1894.
As I may have mentioned earlier, I found Michael Manning's (my ggf) insurance application: he filed the application in 1902 in Boston; he indicated that he had two brothers (both died young - I've only found one potential match - Thomas) and 5 sisters, and I've found 5 likely candidates. However, he also said he had two sisters that died in 1877 of typhus at ages 18 and 21 - I haven't found them. He also said his mother and father were still alive in 1902 at ages 75 and 63 (however, he also said his unnamed grandparents were 93, 93, 96, and 64 when they died, including a 24 year age gap for one pair - figures I find hard to believe).