If I don't fail, "These are families without fathers" in Czech sounds To sjou rodiny bez otců. And "These families are without fathers" > Tyto rodiny jsou bez otců. Please Endless-sleeper and Jamie, correct me if you need to.
Here is a more detailed list of Czech prepositions and the grammatical cases they are associated with if you'd be interested (in Czech). Just watch out that some prepositions go with more than one grammatical case.