Our expert says:
It sounds unacceptable if the mother-in-law or sister-in-law are the child's mother, that they should go across the world and leave the child behind, but its not at all clear from your message how these people are all related. If she is getting emotionally and sexually involved with your sons, you need to discuss this separately with all three of them, ( and of course with your husband participating in the discussion ) and consider alternative arrangements --- surely you;re not the only people who can look after the girl ?
And ANYONE who has sex with a girl of 15, can be guilty of statutory rape, so its not something to be taken lightly
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