How do I grant premium Bitwarden features to 5 friends or family members?

I don’t want to merely share passwords with up to 5 other users, I want to give those 5 users the premium Bitwarden features, which is clearly stated in the Families Organizations plan.

I believe it is automatic. Once your family members are enrolled in your organization, premium features should become available. Just remember to confirm them after they have accepted your invitation to join the organization.