The membership is designed to be one per household budget! This means that married couples only need one membership.
However, each membership only includes online access for 1 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.