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El Derecho de Familia puede ser considerado como aquel sector del Derecho Civil que más transformaciones ha expe-rimentado en los últimos tiempos debido, precisamente, a las modificaciones que se han producido en la propia estructura de la familia. El grupo familiar, con independencia de su configuración y extensión, constituye un dato "prenormativo", en la medida en que las personas que lo forman y sus descendientes no habían requerido con anterioridad la organización previa del Derecho de familia, para poder constituirse como un grupo social al que siempre se le ha denominado familia. El Derecho de Familia es posterior al hecho de la familia, la cual es una institución social que, como objeto de regula-ción jurídica, deviene en institución asimismo jurídica. En la actualidad, la regulación existente parte de un concepto de familia nuclear basada en la unión matrimonial o extramatrimonial de carácter estable entre dos personas, cuyo funda-mento es el afecto mutuo y el desarrollo de una vida en común, en compañía de sus descendientes. El núcleo del Derecho de Familia lo constituyen un conjunto de hechos familiares considerados "primarios", tales como la constitución de la pareja, en la cual puede existir o no vínculo matrimonial, y sus posibles situaciones de crisis; las relaciones existentes entre padres e hijos, y las relaciones personales y patrimoniales entre los de la pareja. Dentro del Derecho de Familia, es objeto de estudio también la institución de la guarda de los menores e incapacitados no sometidos a patria potestad, como es la tutela. Con la elaboración de estos esquemas se pretende facilitar a los alumnos el estudio de esta materia concreta del Dere-cho Civil. Se trata de una herramienta de apoyo para el análisis posterior de los manuales y tratados necesarios para la comprensión del Derecho de Familia, permitiendo un primer acercamiento a las diferentes instituciones que lo componen.