To join a Family Plan you have to be either:
An Account Manager: the person who purchased the Family Plan or redeemed a Family Plan gift card
A Member: the person who received an invite link from the Family Plan Account Manager
You can identify the family plan invite links because they begin with "https://tarteel.ai/family/join/invite/".
For more information on purchasing the Tarteel Family Plan, visit: How to Purchase and Set Up a Tarteel Family Plan.