I don’t understand this whole ‘tar the son with the (perceived) sins of the father’. Does this logic mean that if you have the misfortune to be born into a fam

I don’t understand this whole ‘tar the son with the (perceived) sins of the father’. Does this logic mean that if you have the misfortune to be born into a family that has the capability to perform it’s root functions more effectively than others (providing education) your achievements are worth bunk because you don’t have a story of adversity to overcome? Don’t get me wrong I lean left, believe capability is evenly distributed and opportunity isn’t, but how is this a useful slight?