Let's say that you're imagining a really enmeshed kin-group that has to rely on each other for everything, down to the basics of survival. It basically enmeshes everyone emotionally and any particular person only gets to *borrow* identity or role from this family-system, which basically has narcissism at the group level.
It seems obvious to me that the whole thing must push mimetic rivalry to the kin-group level. Only the most subtle kinds of mimetic rivalry are safe inside such a system.
So anyway I'm proposing that in a profoundly enmeshed community, a "quantitative" individuation (I, me, and mine) might not be possible. Instead identity might be borrowed from a "quantitative" totality (us, we, and ours). And what is borrowed from the totality is a "relational" individuation (filial piety, role, and rite).
Mimetic rivalry in a differentiated kin group: "Mom always liked you best."
Mimetic rivalry in an enmeshed kin group: "Let's all scapegoat the Smith family."