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The statement that intersubjectivity nurtures subjectivation, needs no longer to be proved, despite long and numerous shilly-shallying before including such a paradigm to the psychoanalytic metapsychology. Working within plural settings, especially couples and families, confirms that evidence. But, as the family psychic envelope is in perpetual negotiation with its cultural homologue, examining intersubjective link configurations influenced by culture would inform about mechanisms and processes by which intersubjectivity improves subjective constitution fluency of subjects becoming in intra, inter and transsubjective spaces. The “co-motherhood”, a configuration repeatedly observed in tunisian couples and families, is here described and analysed with the support of a clinical case, in order to confirm this argument.