maybe they were older brother/sister? Personally, I have a hard time judging ages. While it seems weird for older teenagers to trick or treat, it does happen. Parents though?! C'mon!!! Although... now that I think of it--once had a whole family dressed as the Star wars crew from baby yoda to papa Chewbacca (or was papa Darth Vader?) I'm pretty sure I gave everybody candy and it didn't seem weird for some reason. Seemed different somehow.