To say family is incomplete, one-sided, only one facet. Koinonia is togetherness, end of isolation, no Lone Ranger Christians. Not saved in isolation, not keep saved in isolation. No member isolated from others nor ignored when church is functioning normally. No member should isolate self.
Mutuality is submission.
We belong to one another. Each submits to others, each seeks welfare of others. Must know, be known. Implies there is no human hierarchy. Mutuality means no manipulation, coercion, only willing service.