I find the family's need to talk to the witness very understandable, even the father's questions, I can really understand.
pour savoir comment Ariel «était habillé, comment il était»
=to know how he was dressed, how he was...
http://www.tvanouvelles.ca/2018/03/20/les-parents-dariel-continuent-de-croire-a-un-enlevement
Yes, we know what he was wearing based on the description of his clothes but a parent may still want to know details: Was his coat fully zipped up? Did he have gloves on? Did he seem to have a hat stuffed in his pocket? Perhaps they are uncertain whether he had another layer on between t-shirt and coat? Did he seem cold? Did he seem uncertain of his direction? Was he walking aimlessly? ...I would have these very same questions...
I understand why the police are not facilitating a meeting between the witness and the parents but I do wish there was a family liaison officer that was explaining, to their satisfaction, why it's not possible and perhaps seeking answers to their questions.