While that is definitely a trend, there's much more to the story than that. Just having family member at AA isn't the end of the story, it involves a ton of networking and prep that many at the regionals write off as nepotism. Meanwhile, they devote zero time to their apps and networking while wondering why they haven't gotten a call. Some with parents at AA have even received the call and got turned down for one reason or another. Others never get the call at all.