Found this information
1930 censsu
William Harper, age 42, abt 1888 LA
spouse Rose age 38 abt 1892
children Rose age 7 abt 1823
Etheld age abt 1923
Gretna, LA
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WW1 draft card
William Graham Harper, age 33, Marc 16, 1885
spouse Rosa
occupation Railroad Fireman/foreman? Tex & Pacific
725 Franklin, McDoughvile, Gretna, LA
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1910 census
William Harper, age 22 abt 1888 LA
single white
occupation rail road Office
father bn Ireland
mother bn LA
Mother Mary E. Harper age 50
children
Mary E. age 28 daugh., John T. age 24 son, William age 22 son, Josephe age 18 daughter, Annie age 26 daug in law
New Orleans Ward 11, roll T624-523, page 8B, en dist 173
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1900 census
Mary E Harper age 44 April 1856 LA
father & mother bn Ireland
white / widowed
children
Mary E age 20 abt 1880, Patrick 17 abt 1883, John T. 15 abt 1885,
William 13, abt 1887 Johana 10 abt 1890
New Orleans ward 10, roll T623-573, page 7A en dist 98
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1880 Census
Pat K Harper age 30 abt 1850 Ireland
occupation Cotton Screwer parents bn Ireland
spouse Mary age 24 abt 1856 NOLA parents bn Ireland
child Mary age 7m abt 1879/80
New Orleans roll 458, page 10D en dist 1
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Louisiana Marriages
Mary L Fitzgerald
Patrick Harper
2 June 1878 Orleans Parish
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Citizenship filed
Patrick Harper, born Ireland
court dist LA
arrival 1868 port not listed
date of action 1884
witness James Rankin New Orleans
and John T. Fitzgerald New Orleans (he named a son John T. )
{need to check census to see if he had a daughter name Mary.}
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If he retired from RR / collected a pension they would have more info
Good luck in your search
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PS: Individual message cannot be assumed to be "fact".
All data should be verified.