Assuming there is no reason to suspect the 15 year old is unable to care for himself than it's ok.
I wish you the best of luck.
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I think it is illegal. The parent or guardian could expose themselves to a criminal charge of endangering the welfare of a child and I suppose a civil action for neglect.
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I don't think there is a black and white answer to that question. It would depend upon the maturity of the individual 15 year old and the circumstances in which they were left home alone.