“The family” could be linked by blood, beliefs, or any other common denominator. The idea of belonging to a tribe is a vital part to the survival of a particular community. Individuals bonded by something. This tribe is engaged in a processional as well, demonstrating the importance of a ceremonial event, whether it be one of grandeur, or of simplicity like waiting for a bus.
The Tribe represents their common culture along with their history and stories. Yet, before one can be a part of a tribe, one must start as a solo being. Similarly, how you view the pieces individually is very different than how you experience them as a group. But I leave that part of the interpretation for the viewer to define.