The Whitlock's were sniveling and shivering when David's men brought them over and forced them onto their knees. Immediately, before being questioned they started to deny having any knowledge of Humphrey's crimes.
This was because David's men had identified themselves as police and grilled them for a while before Humphrey went berserk.
"Cut the bull shit! We know everything that your son has done and we also know that you knew everything but despite that, you did nothing about it." Amon retorted.
Mrs. Whitlock whined. "We tried! I swear to God."
"No, you did not! Instead, you covered up his crimes and put the rest of your children in danger. "Phoebe reared her hand back and slapped Mrs. Whitlock. "This slap is for Diana, she would be alive right now if you had protected her as you should have done as a mother."