Login to your Microsoft Account - Go To the Family Tab at the top - Create a Family Group

Click on - Add a family member - if you have already created a group

Add Someone to your Microsoft Family or else Create an account

Role of Family Member as Organizer or  Member

Enter Captcha to Add your Microsoft Account as Family Member

Pending Invitation of Family Member

Accept the Invitation - Family Member

Join the family group as member

Member added to Family Group