City of Ladue v. Horn

Ladue's zoning ordinance defined a permissible single-family household as people related by blood, marriage, or adoption. Joan Horn and E. Terrence Jones (defendants), unmarried, jointly bought a seven-bedroom house where Horn's and Jones's children lived together, and the couple shared a bedroom, a joint checking account, meals, and child discipline. The city sued to enforce the ordinance against them; they counterclaimed that the ordinance was unconstitutional, and the trial court entered a permanent injunction for the city.