Do you remember anything about him?
IF he's the kid I remember (I remember two girls and a boy in the family, and the sister's FB page lists him as the only brother, so I'm fairly certain it's him), he was a quiet kid, but polite when spoken to. His parents did enough talking for all of their kids, honestly. I texted my mom to see if she remembers anything - she still lives in the area, and I think she went to high school with his mom. She would talk to his mom and dad often. I remember he was on the bowling team. I plan to see if I can find my senior yearbook when I'm home for Christmas in 2 weeks, because he should have been a sophomore that year. I think the reason I was thinking he was older, honestly, was because he seemed more "mature" in his demeanor than his sister, but looking back, I don't remember him being in school when I started but he was still there when I graduated.
I hadn't heard the girls stopped and asked for directions to the lake. Sounds like it's a rumor, but possible - I don't think I would have known how to get there by myself at their age; I remember asking my mom for directions on how to get there around their age. This case is all so eerie for me, since I rode my bike the same paths they did when I was growing up.
I can say with absolute certainty the last time I saw the parents was at Fareway, circa 2013. That's actually the time I was thinking of, because I remember the dad always made me uncomfortable so I wasn't thrilled to see them. I can also say they did not live in Cedar Falls when they were growing up. The kids went to East, so they lived in Evansdale or East Waterloo. My mom might know. It looks like part of the family lives in Colorado now and parts are still in the Waterloo area.
UPDATE: Apparently, Patrick has a cousin, and he's the kid on the bowling team I was thinking about. I did know Patrick's sister, and she was often seen with her cousin around town. His cousin was also the one on the bowling team. Also, it was Patrick's aunt and uncle who my mom was friends with and I saw at Fareway.