Our expert says:
With his low IQ, despite his age in calendar years, his behaviour is that of a curious 5-year-old. If your daughter shows signs of fear / distaste about the prospect of sleeping over at the house he shares, this may well suggest that he may have attempted to interfere with her. But on the other han d kids can show such separation anxiety at other times, for no clear reason.
It would inded be a good idea to take your daughter ro see a child shrink for discussion and assessment, and of course this would be wise for the neice, too. The BIL might be helped, if he too was re-assessed by a suitable shrink, by medication to reduce his libido and interest in sex. His parents cannot aford to ignore this and pretend nothign is happening, or they will increase the chances that he will indedd be taken away from the,.
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