I personally think an area for parents is an excellent idea as they have a totally different type of question to ask as against an adult P sufferer just looking for answers for themselves.
However, I doubt a room on its own would receive much traffic as is the case with the under 19's room, so why not combine the two?
Parents could read how other children are feeling/coping and likewise, children could read the problems and anxietys faced by the parents. Both groups could well benefit from reading each others posts.
Paul