Let's say she was abducted.
Who ever did it would have been casing the joint. They would have seen that they were not looking after those children in the way they should have been. Easiest fucking abduction of the year.
So the consequences of their negligence as parents means they are now a daughter short.
Had they stayed with the girl like any decent parent should they would still have her today.
Whilst I'm theorizing, how any person can defend their actions based on the fact they have lost one of their children and pedal that its 'not as bad as people are making out' needs locking up in a padded cell.
If she was abducted, those 2 are directly responsible because had they fulfilled their duty as parents it quite simply wouldn't have happened.
For that alone those other kids should be out of their care and with parents who are fit to look after them.