In the community of special needs teens and adults imaginary girlfriends are not rare. Imaginary children on occasion. Imaginary careers, colleagues, relationships. Often based on real people. Belief shaded with grief. 

This doesn’t get discussed in parenting books. 

I am not sure if this is delusion or something else. 

The Yellow Pages were replaced by Google Maps. They became a feature, not an application. 

The White Pages went without replacement. 

There is some lesson here.