The purpose of this exertion is to understand the caracteristics of the family dynamics in the way that one or more of their components is addicted to alcohol and other drugs. To get to this outcome will use the systemic referencial. We understand that the substance dependence is a much a patology itself as a symptom related to a family system. In the individual´s relationship with the family and the same with the individual that is a drug user, it goes on establishing a tangled relational that the most of the times perpetuate the disfuncionals patterns that helps to sustain the dependence in the family. It is indispensable, in the treatment of the dependence, to come to grips with the family ties so that family system can find healthier alternatives in the relationship, in order to promote a progressive change in the interaction patterns that are facilitators for the maintenance of the addictive behavior.