Welcome to WikiTree. Find-A-Grave has the following entry for Benjamin Franklin Lightfoot: http://www.findagrave.com/cgi-bin/fg.cgi?page=gr&GSln=LI&GSfn=b&GSpartial=1&GSbyrel=all&GSdyrel=all&GSst=25&GScntry=4&GSob=n&GSsr=81&GRid=69815408&df=all&
There is is also a photo.
You might try FamilySearch.org.
1900 US Census here: https://familysearch.org/pal:/MM9.1.1/M934-39V
1880 Census: https://familysearch.org/pal:/MM9.1.1/MZ9J-2QM
1870 Census: https://familysearch.org/pal:/MM9.1.1/MNSQ-K7J
1850 Census: https://familysearch.org/pal:/MM9.1.1/MHVH-VF1
There is also a family tree at:
https://new.familysearch.org/en/action/hourglassiconicview?bookid=p.9Z4X-1S9&focus=p.9Z4X-1S9&svfs=1&justredirected=1
I'm sure there is more, but that should get you started on the right track.