“…The historical background that follows identifies by whom and when they were proposed and why the fate of Families 2 and 3A was sealed, at least in the short term, by the hostile response they received from Karl Pearson. That hostility is well documented in the special edition of International Statistical Review published in 2009 in honour of Pearson and appears to have manifested itself in response to the criticism his famous “system of curves”, in modern‐day parlance, “family of distributions”, had received from the likes of de Helguero, Edgeworth, Kapteyn and Markov, the latter's criticism being especially vitriolic (Seneta, ). The main objection to his family was that Pearson provided no generating mechanisms for it.…”