The purchase of one membership can be used per household budget. Spouses and engaged couples can use a single membership together!
Keep in mind, however, each membership only includes online access for one email address. Therefore you will have to share the sign-in information to access the online tools.
This means that you and your spouse will share the same Ramsey Solutions ID, but you should not share your account information with anyone else. Each family going through FPU should have their own Ramsey Solutions ID.