Her perfect son could do no wrong, is the impression I get with her. Even when this happened she seemed to have to get pushed into checking the CCTV. I suppose we'll never know how much his father knew.
I don’t think she was pushed to watch it. She asked for advice from a friend (TMs aunt) about handing it in to the police though. The handing it in to eliminate him from their enquiries is BS IMO. Who wakes up their som asks if they know anything about the disappearance of a 6 year old and then says ‘remember who ever done this their DNA will be all over this’. I believe she knew. Or at least had a gut instinct.