Invisible Child

Invisible Child is a 1999 American television drama film starring Rita Wilson as a mother who imagines she has three children when she has only two. Fearing his wife may be institutionalized because of her delusional disorder, her husband goes along with this charade as though it is perfectly normal. The 10-year-old daughter assists her father in facilitating the delusion. The youngest child seems to really believe that he has a sister named "Maggie." They hire a nanny who initially goes along with the family's unusual situation, but she becomes concerned about the effects on the real children and reports the family to child protective services.