1880 census may be found online in your library...
Not all censuses have been fully indexed. To find Lawson Alexander and his parents on the 1880 census you may have to look first at the Soundex Index on microfilm.
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Record all the information you find on the Index, for example:
Roll # 581-12th Census of the Population of Louisiana, Vol. 36, St. Landry Parish (1900) Enumeration District 54 - Police Jury Ward 2 (part of) Justice of the Peace Ward #5, Dwelling 311/311
Be sure to include the page number; I failed to do that.
Ask your librarian for help.
Rosie Morein Wells