def METHOD_NAME(self):
    r"""
    Return the underlying Sage set of the wrapper ``self``.
    EXAMPLES::
        sage: F = Family([1, 2])
        sage: F is Family([1, 2])
        False
        sage: sF = F._sympy_(); sF
        SageSet(Family (1, 2))
        sage: sF._sage_() is F
        True
    """
    return self._args[0]