User blog comment:MaverickGuy720/My Take On Not A Loud/@comment-26302585-20170930031150

I personally don't believe it's about the "Lincoln is adopted" Theory. It could be about the sisters just as much a Lincoln. Maybe it'll have something to do with the parents too. Know one really knows. Some title cards before were misleading, such as "Friend or Faux", that had Lincoln sitting next to Lisa, yet Lincoln had only a few seconds of screen time in the actual episode.