Building on the information supplied by ev:
Gravestone
Joseph F LITTLEJOHN 1866-1918, Emma H LITTLEJOHN 1876-1946
1910 Census New Orleans Precinct 8 (on FamilySearch)
Joseph F LITTLEJOHN, 44, m19yrs, born North Carolina, parents born Cln(?) & Vir, clerk, mercantile
Emma LITTLEJOHN, 36, m19yrs, 5 children all living, born Illinois, parents born Maryland & Indiana
Henry F LITTLEJOHN, 18, born Louisiana, parents born North Carolina & Illinois, collector wholesale insurance
(and other children)
1870 Census New Orleans Ward 1 (on FamilySearch) POSSIBLY
Joseph LITTLEJOHN, 55, (?) wholesale grocer, born North Carolina
Mary LITTLEJOHN, 38, born Virginia
Joseph LITTLEJOHN, 4, born North Carolina
(older children born Mississippi and Louisiana, also Bridget Laughlin, 55, born Ireland)
(ADDED) The 1880 census for New Orleans Parish shows Joseph snr's parents both born NC, Mary's parents born Mass and Va. Joseph snr is a broker.
If this line is correct, we need to find a birth c1815 for Joseph LITTLEJOHN snr in North Carolina c1815.
Philip