Que Dios bendiga su familia. ________________________It's easy for us non-native speakers to forget the personal "a"It should be: Que Dios bendiga a su familia.(if you're speaking in a formal...
Que Dios esté con -tigo (singular - familiar) (one word contigo, not con tigo) usted (singular - formal) ustedes (plural) vosotros (more biblical - can be taken to mean "all of us")