(Posting 13 years later!....)My sister's research says that your Julia Tierney is our great-grandmother Hellen's sister.Mary and Michel Tierney came to the US from St. Jean, Canada (and may have been some of the Irish who first came to the US, went to Canada, and then came back--don't know)
Here is the information, see if it matches up: Mary (b. abt 1837 Ireland) and Michel (abt 1830, Ireland) Tierney (on one census spelled Tirnney) Children & birthdates: Richard, 1857 Eliza, 1862 Mary, 1868 Julia 1871-1921 Josephine 1871 (? - twins?or "Irish" twins?) John 1874 Hellen (My great-grandmother) 1876
Please let me know if you get this and if it matches--finding information out about the Tierneys has been very difficult!