Alex felt enraged and appalled by his dad's apologies. He was tempted to go after him and address his man-to-man. But he knew he couldn't leave his sisters behind, especially now that all four were crying. So he decided that he would first take care of his sister before going for his dad.
Abigail on the other hand watched her father disappear out of sight. She felt furious with the way he didn't completely own up to his mistake. She expected him to go around his children and beg for their forgiveness instead of just generalizing his apology. She also expected him to answer some of her questions or even counter her claim instead of crying and saying sorry. But to her disappointment, he just apologized and walked away like his crime wasn't that big of a deal.
Reevaluating her stance in the Silk family, Abigail decided it was time she left for good. She had no clue what her stepsisters were thinking and she didn't want to stick around and find out.