So... from knowing nothing about this I have spoken to someone I know in the congregation where this family is in Portsmouth.
Apparently the poor child has been sick for a while and the congregation has been providing alot of support. It's a large family and the mother has been pretty much 24/7 at the hospital and the dad has been there everyday as well. The congregation have been supporting the family and taking care of the other kids, providing food, going to the hospital etc.
From what I understand, there is no court order and blood is not the issue. The poor boy had a major brain operation and he has not been able to recognise anyone or communicate in anyway since. The prognosis is poor. Regarding the reason for taking the child, even those who have beein in daily contact do not know. No one knows where they are heading or why. The phrase used was "the parents are distraught and desperate". Everyone close to the situation wants the parents to return.
There is clearly much more that will come to light but it does seem that this is a unilateral decision on the part of "distraught and desperate" parents. The priority is the child but my sympathy goes beyond the poor. sick child and to his parents and siblings. It is truly a sad and desperate situation.