In the 1880 Census Smith Cox has same dau Mary and Catherine and now a third dau Ellen b. in 1871 but his spouse is now listed as Bridget b. IRE
Then in 1910 his wife is listed as Mary, but young enough so that she is undoubtedly not the same Mary/original, or the age is transcribed incorrectly.And two younger daughters born in the 1890's.
Can't find the birth records for any of these girls??? 1870 Census
Name:Smith Cox Estimated Birth Year:1843 Gender:Male Age in 1870:27y Color:White Birthplace:New York Home in 1870:Connecticut, United States HouseholdGender/Age Smith CoxM/27y b NY abt 1843 Mary A CoxF/27y b IRE Mary A CoxF/2y bCT abt 1868 Catharine CoxM/9mb CT abt 1870
United States Census, 1880
Name: Smith Cox Residence: Brooklyn, Kings, New York Birthdate: 1842 Birthplace: New York, United States Relationship to Head: Self Spouse's Name: Bridget Cox Spouse's Birthplace: Ireland Father's Birthplace: New York, United States Mother's Birthplace: New York, United States Race or Color (Expanded): White Ethnicity (Standardized): American Gender: Male Martial Status: Married Age (Expanded): 38 years Occupation: Laborer NARA Film Number: T9-0846 Page: 670 Page Character: B Entry Number: 1031 Film number: 1254846 Household Gender/Age HeadSmith Cox M/38 abt 1842 NY Spouse Bridget Cox F/40abt 1840 IRE Child May A. Cox F/12 abt 1868 CT Child Catharine Cox F/10 abt 1870 CT Child Ellen Cox F/9abt 1871 CT
United States Census, 1910
Name: Smith Cox Birthplace: New York Relationship to Head of Household: Self Residence: Stamford Ward 4, Fairfield, Connecticut Marital Status: Married Race : White Gender: Male Father's Birthplace: England Mother's Birthplace: England Family Number: 25 Page Number: 2 Household Gender/Age Smith Cox M/66y b NY Spouse Mary Cox F/51y b NY Child Harriot V Cox F/19y b .CT Child Florence M Cox F/17yb. CT