There is no one answer. Depends on the political culture and how party membership is viewed. US has no real fixed concept of paper membership (no id cards)ect) Look at the current primary debates. I contrast Israel appears to have stronger p, arty ids. The key variable depends very much o the depth of political cleavages, especially around zero-sum, non-bargainable issues (religion, etc).
In Ireland those who are in politics seem to encourage amongst their children an interest in politics and this in some ways can hinder or help a party. It can also blur the political landscape as one begins to wonder is it the party or the name that is being. Ores in. Some individuals end up becoming bigger than the party resulting in much of the corruption we see today. Also politics holds little interest among today's youths those who are involved belong to the young wing of each individual party again many are linked already to political representatives either sons daughter nephews or nieces. Having never really examined political thing by in other countries but having listened to news coverage the same ca. Be said for many other countries as often sons or daughters run in parents place s seeking to control change or influence the political instability in their respective countries