Raise the issue on which are the main foundations supporting the constitutional recognition of hereditary rights in favor of the concubine own, has imported set as the primary objective the identify, assess and sustain such fundamentals, which are within of social, economic and legal demonstrated in the results of this research, having been obtained from the information used, which has become the theoretical framework this report supports the well after application of the methodology concerned, it became possible identify the aforementioned results, as are cohabiting fulfill the same roles and duties of spouses in the life daily (as a couple and parents) are members united by affection and give rise to a family is made under the scope of the constitutional principle full family protection; them applies the fundamentals of inheritance for the spouse, under the principle of equality and th...