I have been following this story and it's heartbreaking! I, like another poster, can't make a judgement on the parents. To me, in the video, the dad clearly is upset. I can see it in his actions and hear it in his voice. I can't imagine what it would be like to have one of my kids go missing, can't find, police coming, asking me to take me from my home where my child might return to and I wouldn't be there to hug, kiss, and hold them, and then having to deal with cameras and microphones in my face. And, honsetly, I would be asking to get my phone because that's how my child would be able to get a hold of me, especially now that I wouldn't be home! So, my phone would be very important. He also said he had people out looking for his son who needed to get a hold of him. That too is logical and something I would want.
As for the parents being taken to the station, they may have been a distraction to the investigation. Not necessarily to hide stuff but from the stress of the situation. Maybe the parents started arguing and taking them to the station was the best solution so the police could do their work.
It's hard not to be quick in judgement. This makes me think of the Isabel Celis case. So many jumped on the parents did it/hiding something train and years later the found and convicted the man who broke in to the girls room and took her while her parents were sleeping. Her parents went through hell as the public and media basically incriminated them right from the start.
I truly hope that they find this little guy alive and unharmed.