It would be superb if a family could share member contacts. The idea is that different people in an extended family live at different places. They keep moving and hence their contact details keep changing. If we could (say) share our contact information (something like a .vcf) in real-time using Google Contacts such that if I were to move to a new location or change my number, I could update it in my Google Contacts and it would automatically get updated in every family member's contacts. Wouldn't it be amazing!?