You can invite any Qube Money user to join your account as your companion. They must be at least 18 years old and have an active Qube account. When you invite another user to join your account, you both will have access to the same cloud, qubes, funds, and ACH information. Currently, all qubes are shared in a Premium Account, and there is no "Private" qube functionality for each of you to have a qube or qubes that the other cannot see or access.
The primary account holder is responsible for all transactions/actions within the app made by the secondary user. The primary account holder is the person who sends/sent the invitation to the other user to join accounts. The secondary user is the invitee. When the accounts are joined, you will each keep your own debit cards, but the invitee's account number will change to be the same as the inviter's. The secondary user (invitee) will not be sent a new card after joining the primary user's account.
If you're looking for more information on who can join your Family Account, click here.