I am no one! I have no connection with this case or anything to do with safeguarding children at all. I do know how the press works and what local authorities can and can't comment on. I can assure you they will not sue for libel if the reported situation is not true. It is naive to assume that because they have not sued it is not true.
There are many safeguarding issues reported in the press which are simply not true, or are only one side of the story, or which are a distortion. Institutions do not sue.
If these little girls are living in a house with a known sex offender, then that is absolutely awful. The mother cannot have her children's welfare as her priority. But it is not automatically illegal to be a terrible mother! It is not automatically illegal for a sex offender to partner up with a mother. Rightly, the authorities in this case are watching the situation and by their own admissions, they have set certain conditions in place which allow social workers, police and other agencies to monitor the situation. We have no idea if this includes locking the girls in their room. The court will have decided how the monitoring can take place legally. It would be mad if a sex offender could challenge conditions because they had not been put in place without due process.
Of course courts may make wrong decisions. But we just don't know and cannot know the facts in this case. Getting on high horses and saying everything is wrong and why aren't they fostered and why can't the grandmother take them etc etc is to pretend knowledge you cannot have.