Hi William,
Thank you for contacting us. Are you looking to share all information between you and your wife, or are you both going to want to keep information private to each of you as well? If all the information both of you store in mSecure can be visible to you both, you will only need to have one account, and that will only require one subscription on the account. If, however, you both want to have private data as well as shared data, then you'll need to upgrade to a Family subscription for both you and your wife.
How do you want to proceed William?
William