This is a shocking story!
As far as I can tell both the children, and their mother, feel that they were abused. What worries me is that it appears that the social services were simply following normal procedure. One wonders how many young people go through this ordeal each week and whose feelings are not taken in to account, and whose stories are not told.
If a child feels abused, or violated the feelings will usually stay with them throughout adult life. It dosen't matter if what happened is a "Standard Procedure". Abuse is a wide ranging thing and people should really listen to children more.