Our expert says:
Of course I understand your concerns. Pushing your son too hard for the information you seek, would probably make him all the more likely to "forget" it. It sounds as though circumstances at the little girl's house may be odd, and maybe child welfare might become interested in checking on that. Otherwise, while parents are understandably anxious about signs that their children may have become involved in at least sex-talk with another child, this happens far more often that we are aware of, and apparently without causing any harm. Rather many adults recall such incidents in their own childhood, and have grown up just fine.
Maybe let this rest a few days, then become more involved in pleasant, relaxed, parent-child chats with your boy --- about school, friends, and then about what he knows and thinks about this girl's family and what they do in that home ; and make it clear to him that if he comes across anything which bothers him or which he doesn['t understand, he's welcome to chat to you about it and to ask relevant questions.
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