How to define who is and is not a fit parent is the question posed by a new documentary, "Tough Love," on PBS. 

It tells the stories of two families on opposite sides of the country, both of them featuring parents in an emotional tug-of-war with Child Protective Services. 

Stephanie Wang-Breal, director of the documentary, joined the show with more.

Listen to the full interview by clicking the blue audio player above.