I have very little doubt this is the correct record. DOBs are correct (Joseph) or consistent (Christy)...but the "Married 25 years and 2 children" part confuses me as well.
Source: Year: 1900; Census Place: Washington, Buchanan, Iowa; Page: 12B; Enumeration District: 0055; FHL microfilm: 1240420 Added: 19 Jan 2019