Here are the transcriptions of the three census years I have found for (my) Elijah P. Flandreau. They are 1870, 1880, and 1900, and are in Brooklyn. I transcribed the information as faithfully as possible from the original (microfilm) sources.
The row-and-column format of the origianl census records is hard to reproduce in this message, so I have chosen to show them in comma-delimited format (CSV), so they can be easily copied and pasted into an Excel spreadsheet if desired.
US Census, 1870, NY, Brooklyn, ward 15th, p. 493:
dwelling #1035, family #2161
[last name,first name,age,gender,color,occupation,real estate,personal estate,where born]
-,Mary E,33,F,W,Keeping house,,,NJ
US Census, 1880, NY, Brooklyn, v33, ed112, sh11:
272 South 5th Street, Brooklyn, NY
[last name,first name,age,relation,occupation,where born,where father born,where mother born]
-,Mary E.,44,wife,keeping house,NJ,NY,NJ
US Census, 1900, NY, Brooklyn, v88, ed406, sh2:
1012 Lafayette Ave.
[last name,first name,gender,relation,birth,age,where born,where father born,where mother born,other]
Dososway,Harry,M,head,Aug 1861,38,NC,NY,NC,married 14 years
-,Lola,F,wife,Feb 1869,31,NY,NJ,NJ,mother of one child
-,Harry Jr.,M,son,Jun 1887,12,NY,NC,NY
Flandreau,Eligah,M,F in Law,Mar 1829,71,NJ,NY,CT
[The birth years and ages in this census entry are suspect,because:
1880 Census and Lola's death certificate put her birth in 1866,and
1860 Census puts Harry Sr.'s birth in c. 1858,
which both conflict (by 3 years) with what's shown in this 1900 census]