User blog comment:MaverickGuy720/What's Not a Loud?/@comment-32053026-20170723175510/@comment-32173189-20170723230427

I'd like to add another potential theory to the list

D. One of the kids (mainly Lincoln) thinks they're adopted due to a series of coincidences only for it to be confirmed at the end that they are in fact a member of the Loud family.