If any descendants possess a Dao Seed, they would have the advantage of proximity to resources, making it easier to be selected. Although not quite a 'cultivation family,' most of the children serving the True Man closely are selected from these well-known villagers.
If three or four generations in a row have someone who joins the Inner Sect and receives the True Inheritance, the family's rise would naturally follow as a matter of course.
Additionally, every month, prominent families like the Pei Family form groups to enter the mountain to provide tributes and trade for necessary provisions, so they are not entirely isolated from the world. Every sixty years, the previous generation of disciples will have formed their Elixir, passed through their tribulations, and the mountain gate will open again for a large selection, choosing a new batch of newbies. Over generations, as the numbers grow, they ascend from village to town to city-state.
