That isn’t the point at all. It’s a minor aspect. Presumably you support the concept of a judiciary, you have no say in who you get, you can’t get rid of them if you don’t like them, some of them are rubbish. You don’t want to abolish it though.
Members of the judiciary go through a process to get where they are. They start off by getting the right A Levels to go to law school, then they apply for jobs, then they go for promotions. And so on.
Yes, there is the network of people from the "right" schools etc. who form part of that judiciary, and there's also some nepotism, both of these aspects are part of the "system" which includes the monarchy, peers, non-majority government, all of which needs reform.
However, if I were a judge, my eldest child would not automatically become a judge, too, so your comparison falls down on that point alone.