How accurate does a show have to be?

I’m writing a web series about teens living in a foster home. It’s a comedy, and intended for males 11–18, and kids in foster care.

I asked about the pilot on Yahoo Answers. And my pilot ended with the newly-fostered twins ringing the doorbell. Then in the next episode, the teens already in the home greet them. Then a girl in foster care said:
“Children in foster care don’t ‘ring the doorbell”. The CPS worker does that, while the kids remain in the car. During that time, CPS will do a quick review of the home to be sure everything is as it should be. After that quick inspection will the kids be invited in, and introduced. They won’t have “luggage”. Kids in foster care travel using black leaf bags provided too them by CPS case workers. The introduction isn’t like meeting the family of friends. It’s not all smiles and welcome. It’s a passing off from CPS to foster parent – nothing more.”

So how accurate should the show be with the fostering experience?