The Peacock limited series “ All Her Fault “ about a playdate gone wrong has elicited a major response from moms who find it both triggering and validating to see their everyday experiences appear onscreen. Peacock is owned by TODAY’s parent company NBCUniversal. “I’m the default parent and you’re the substitute,” Dakota Fanning says to her onscreen husband. “It’s not equal. It’s never equal.” Neha Ruch, a mom and author who is rebranding stay-at-home motherhood , defines a “default parent” as “