OK another weird one. There's this film where this women has an invisible child as well as normal visible children. In on scene they go to a theme park or something and the mum looses the invisible child. The whole family has to run around the park looking for this invisible child which only the mother can see!
Does anyone know the name of this film?

Possibly Invisible Child (1999) (TV) (http://www.imdb.com/title/tt0172606/)

Oh yeah! That seems a bit obvious now