As for the children, legal procedures must be taken such as a hearing to release them to the mother's custody. This has to be done as soon as possible too. That procedure is different than the court procedure for the father. Not knowing much more, there is a decent chance to get the kids home soon. Of course, if the kids say they don't want to go home because they are afraid for their safety, that would make the matter worse and difficult.
If the family needs legal representation, they could certainly contact my office at any time.