Sina family card allows an account holder to provide another individual with access to their credit line through a separate card. The primary holder sets a limit for the each member of family card. Each authorized user has a unique Sina card number. Sina family card is much more secure than carrying cash and helps customers save their precious time. Sina family card is ideal for parents who want to make sure their teens have funds available when needed, especially in emergencies and also help them save more.