I don't think you're going to have 6 girls in one house that way. Look at how mine works. Lydia is my wife, so that's a given. Serana will be my follower and for some reason will allow another follower to be with me, so I can bring the Darkbrotherhood Initiate. Gabriella II is my Dead Thrall, Aela my stewardess, and Oriella the bard. Thats the key to having 6 girls in one house hold. Follow that system and you can have as many girls as Tenchi.