All us grandparents need to be nosy neighbors and take an interest in knowing the kids in the neighborhood and maintaining a healthy curiousity.
We are all responsible to see that crimes and suspected crimes are reported.
Kids will usually tell you what is going on if you take a little time to know them.
My son was molested by a neighbor's son for four years and none of us even had a clue. He was eight when it all started. Since he and my other two sons were always at the neighbor's house or they were at ours (they had 9 kids), and my son never said one word, we had absolutely no idea. Kids do NOT always tell you what's going on because they might be afraid or ashamed to.