
Quoting
free9man
The police may follow up with you or they may simply take an informational and do nothing more. Given the son is 18, if the alleged contact occurred after he is 18 and the son doesn't express any concern, the police aren't likely to care unless the parents have some kind of guardianship.
Did you actually contact him? Because your post seems to indicate maybe yes and maybe no. Had you previously been told by him or his parents not to contact him?
Just do as you said and don't have any further contact.