Margaret O'Brien (daughter of John O'Brien) was born Abt. 1832 in Ireland, and died date unknown. She married Francis Gaynor on July 15, 1851 in Boston, son of James Gaynor.
Notes for Margaret O'Brien: In 1860 US Census, Mary O'Brien is living with the family. She is 53, born in Ireland abt. 1807. Most likely Margaret's mother.
1860 US Census states Margaret is born in Mass., but her marriage record states born in Ireland.
1870 US Census, a John O'Brien, age 35, born Ireland, occ. Teamster is living with family, most likely Margaret's brother.
More About Margaret O'Brien and Francis Gaynor: Marriage: July 15, 1851, Boston.
Children of Margaret O'Brien and Francis Gaynor are:
Susan M. Gaynor, b. Abt. 1853, Massachusetts, d. date unknown.