First, I think we would need to find out if Damon's family lived in the Broward/Miami-Dade area back then. If you know his parents names you could do a search of the public records. Problem is, they probably aren't on line all the way back to the early 80s. The document # could be online, but the actual document probably hasn't been scanned. You'd have to go to the Courthouse and ask to look through the microfilm.
IIRC Damon lived with his parents in Hollywood, Fla. before turning 18 and had been born in Fla.
After he went away to college, his parents divorced and his mother continued living in Ft Lauderdale, but I have not seen what happened to his father.
I have often wondered, even before this case, what ever was known if anything about the white teen much older than Adam Walsh, who was expelled with Adam from the video game arcade after the blacks started trouble. That teen, after all, was probably the last person to have seen Adam alive, besides the perp...unless the teen and the perp are the same...