Genealogy.com has the 1900 census.There is no Thomas Penney in Nebraska ... but there is a Thomas J. Penny (no E)who is in Saunders County, not Douglas County.My county map for NE shows that they are neighboring counties - so here's the info.
Thomas J. Penny b. Sept 1827 in Pennsylvania, age 72, married 43 years, occupation: Minister. (father born in Ohio, mother born in Pennsylvania.)
Martha E., wife, b. Dec 1835 in Pennsylvania, age 64, married 43 years, mother of 4 children all living.(both mother and father born in PA.)
Mattie R., daughter, b. May 1859 in Ohio, age 41, single, occupation: music teacher.
Lucile J., daughter, b. Aug 1874 in Iowa, age 25, single, occupation: teacher.
Thomas C., son, b. Nov 1876, age 28 (? did I read that wrong?), single, occupation: druggist clerk.
Hope this helps.If this isn't the Thomas you're looking for, let me know.Perhaps he's only listed under the first initial "T".