Babysitting nephews and nieces once in a while is often the best way to help out exhausted parents and give them a little time to themselves. Unfortunately, things can take a turn if the child is unruly or leaves the babysitter injured.
This is exactly what a woman faced when her nephew with autism bit her hand for twenty seconds because he was overstimulated. She demanded that her sister lay down the law for him, and was shocked when nothing was done about it, so she refused to babysit the teen again or attend Christmas.
More info: Mumsnet
