Which family does NOT have electronegativity values?

It is not true to say that any family does not have electronegativity values. It is tempting to say the inert gases, group 18, but we have a value for the electronegativity of xenon, 2.6 on the Pauling scale. Some of the other members of the group form compounds, though they are difficult or impossible to isolate, and their electronegativities have therefore not been measured. Whether they can thus be said to have electronegativity values or not is a moot point.