Due to Adam working long hours, Shelby felt like a single parent. The children refused to listen or respect her & at one point, she cried that she didn't enjoy being a parent. In the face of repeated disobedience (such as her kids not going to bed when she asked them to), Shelby felt "sometimes giving in is the only way."
Shelby invented imaginary police officers to get her twin sons to behave. When they acted out, she would say, "Do you want me to make a phone call?" and pretend to call the pretend police (Policeman Smith and Policeman Jones) until they were scared enough to obey. If the kids continued to disobey, she would make the call to Adam, who would pretend to be the officers and use pretend voices to talk to the kids.
Jo pointed out to Shelby that she should have the authority to make her kids behave, not hand over that authority to pretend police officers.
She was 37 at the time and is now 45 in 2016.