Yes, I do too, as do some other posters. I actually believe that CS, NS, DN and DS were all aware of what happened, and that the reason NS was kept away from the cameras was because she couldn't be trusted to act 'normal'. They chose DS who was possibly the most articulate of them all. CS backed SH's fictional account of the funfair visit, and I think after she'd found out what happened, she was the one who organised what they were going to do next.
I'm not sure if I think anyone else was directly involved in her death apart from Hazell, but I do think that once Tia was dead, everyone was told what had happened, and told how they had to act etc. Gran 'runs' the family, I think - and Natalie would have been very influenced by her, and possibly the uncle (her brother) too.
I too feel this story has more to it than SH being involved in Tia's death and hiding her body on his own.
I also think that Tia's body was not in their loft during the first police searches.
Why she was put in the loft,not hidden else where before being announced missing I am not sure.
If other family members were aware of what happened they need not have reported her missing for a couple of days giving themselves time to hide the body.
Did they want Tia's body to begin to decompose before being hidden away from the house to hide certain evidence.
I still think there is something about the mobile phones.I think Tia would have taken her own even if it was not working .I do not think NS would have willingly let Tia take hers.