This episode marks a major shift where the investigation into the girls' counterfeit operations becomes much more personal and dangerous. Good Girls Season 4 Episode 2: 'Big Kahuna' Review

Sara’s kidney donor family, Carl and Jenny, return unexpectedly, announcing they are moving to Detroit.

"Dave" (Agent Dave) insists on reviewing the company's financial books before finalizing the deal. Despite Beth's explicit instructions not to, Dean hands over the books at a bar, effectively giving the feds the evidence they need for his arrest. The Hill Family: The Donor Storyline

Ruby and Stan, already feeling intense guilt, fear the family is going to continuously ask for money. When the topic of a "financial arrangement" is raised, Ruby snaps and tells them they "don’t owe [them] a thing".

The family actually wanted to give Ruby and Stan money—specifically $87—leaving Ruby feeling sheepish about her outburst. Annie’s Struggle