Our expert says:
having sex at 13 whilst not completely out of the ordinary is actually illegal. Whoever is having sex with her could be charged with statutory rape regardless of consent - because at 13 the law does not recognise consent. 16 is the age of consent.
If your wife is not wanting to speak to her brother about this then she should consider being honest with his daughter about the legal implications and also that being old enough to have sex means also accepting any consequences - i.e. pregnancy. How will your wife feel if her brother later finds out she knew and didnt tell him?
She is not too young to have sex education, but to actually engage in sexual relationships then this is where the law is clear, but young people's choices are more blurred.
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