Is this really a kids film, ie suitable for my 6 yo DTs? Or is it one for adults? I've watched the trailer and can see it'll terrify her, but he might be ok. Slightly concerned about 3D element having read that we've underestimated how it disturbs kids. A classmate is having an Alice film party, so trying to judge whether or not to let them go. Seems v mean to vet, but the fun isn't worth her getting distressed and the nightmares...