Trying to get the facts (in hope of finding Mary Ann's birthplace or other clues):
1850 Brooklyn Ward 5, Kings Co., NYLawrence Doyle, born c1823, Ireland, House Painter
Bridget Doyle, born c1824, Ireland
Could this be "your" Lawrence?
1860 New Orleans Ward 2 censusLawrence Doyle, born c1825, Ireland, Painter? and Delia, born c1832, Ireland
Mary Ann, born c1851, NY? Emma, born c1855, Louisiana John, born c1859, Louisiana
1870 New Orleans Ward 2 censusLawrence Doyle, born c1822, Ireland, Painter and Delia, born c1827, Ireland
Mary A, born c1851 Emma, born c1856 John, born c1858
Lizzie Taylor, born c1850, Louisiana, Domestic
Added: Children were born in Louisiana (forgot to add that earlier)
1877, Lawrence Doyle, born c1820, died 12 February 1877
1897, Widow Lawrence Doyle, born c1829, died 7 March 1897
1901 Massachusetts Marriage RecordEmma (Doyle) Girling, age 40, Widowed - Second marriage. Born New Orleans, LA. Father: Lawrence. Mother: Margaret Gilgan. Residence: 5 Cootes?, Boston. Occupation: "at home"
Married John Henry Jacobs, 49, Widowed - Second marriage. Born ?. Father John. Mother Marietta Wilbert. Occupation: Manager. Residence: 12 River.
April 25, 1901, Cambridge
Birth record for J.H. Jacobs: born Quincy, MA 27 September 1852. Father's occupation: Bootmaker?
1870 Quincy Census: John Jacobs was a boot-cutter, born Mass. Marietta born Mass. John H: Apprentice Carpenter
1908 Massachusetts Death RecordJohn H. Jacobs, died March 6, 1908. Widowed. Born Quincy, father John Jacobs. Baggage Agent. Burial: Quincy, Mt. Wollaston
I was hoping to find Mary Ann near her sister, Emma (since possibly her parents, her husband and her only son died prior to 1904), but with an apparent death of Emma prior to 1910, that doesn't seem likely. Perhaps Mary Ann was living near John, her brother? Would she have remained in New Orleans without family members nearby?
(I didn't forget any other family members, did I?)
PS You're right - E. G.
was noted as married, although no years of marriage were included.
Looking at other writing on the census page, E. "G." appears to be G as it is similar to the G in Germany and the G in the names Girlie and George.