Two wives - both of Dukes I think - on the PM programme were discussing primogeniture with regard to their daughters. The Royals now have this sorted out, so why not the families holding hereditary titles?! One of the Ladies, who thinks things should stay as they are, introduced the red herring of the position of younger sons which is, of course, irrelevant, but the other said that the duchy will end when her husband dies, because there are no males on whom the title can fall. In my opinionb, such titles should pass to the oldest daughterif there are no sons.
and for those who think the whole system should be abolished - wel, it isn't going to happen soon, is it?! Therefore, it should catch up with the 21st century.