Our expert says:
Hello again TM,
Delighted to hear that your daughter is doing so well : well done to you, her, indeed all of us.
The other child sounds almost feral, though young enough to still be able to learn to be civilized. Uncommonly, such a situation may be related to a child with serious developmental /neurological / psychological problems, if he has been exposed to proper disciplinary opportunities and encouragement to learn, from his parents, and is failing to learn despite all their best endeavors. Most commonly, it suggests really bad parenting, often absurdly over-indulgent. Though it is too often not seen as such, spoiling a child to a serious extent is, to my mind, a form of child abuse or neglect.
But you can't take over the upbringing of someone else's child. You can calmly but firmly make it clear that (a) this child will not again be welcome in your home ; and (b) that you strongly recommend that they take him to see a good child psychologist for a full assessment and advice, making sure that the psychologist is told in some detail about the problems and concerns other people have noticed about his behavior.
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