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The specificity of the stepsibling bonding can provide insight into the sibling relationship beyond the concept of a purely biological relationship. The particularity of the stepsibling bonding, the co-presence of full biological siblings and/or half-siblings and/or quarter-siblings, resides in the decline of the degree of blood relationship and in the intensification of the dimension of co-residence. In this type of sibling group, co-residence is central because it becomes the common denominator for all the children.From designated children’s spaces to those for the family as a whole, the reconstituted family of stepsiblings lives in several places and consequently modifies how and for what purposes those spaces are used. Within these interactions which define being brother or sister, ways of being together and modes of coexistence are constructed, supported and reconfigured.