"This is unacceptable," Esteban starts, and she rolls her eyes as he starts demanding baptism, priests, church. The tears stand in her eyes. "Sorry, he's Jewish. Snip-snip, eat fish, start saving for law school." See what you made me do? her eyes ask accusingly. Do you see how far I'm willing to go with this, for you? "I am his father, I choose his life." She snaps to attention, having finally been given her opening to say what she's been practicing: "You had your chance to choose, you walked out. I have to think about the baby now," she says, making for the door, and Esteban says this is just more selfishness, not a mother's love. She's offended, considering the whole birth certificate thing that started this mess, and the position it put her into.
Esteban steers them into scarier waters still: "My son's not going to be raised by that pendejo," he barks, and she looks into his eyes: "That pendelo sticks around. He fights for what he loves. He's not a coward." Mission accomplished: Esteban kicks the furniture, throws things around, the whole bit. And now that she's fully angry, but more importantly now that she's said the hurtful things she was saving up to say, she can throw him out.
Esteban calms down immediately, holding up his hands, and she closes the gap between them, quickly; he smiles, thinking she'll kiss him, or hit him, and they will come back together the way they always do. He thinks this is about sex, but it's not: it's about power. His smile only makes him weak. She pushes at him, throwing punches, nearly screaming now: "Get out! My son won't grow up to be like you. He won't see you, he won't know you..."
Esteban grabs her fists, trying again for the clinch, swearing that the child is his, but that's not what he means: he means she is his. And they both know it: "No," she says, "You've lost him." She prays it's true; she promises herself it's true. He breaks the clinch and leaves, slamming the door behind him. Nancy sits down, wondering how she fucked that one up; Andy appears holding their son, and the look in her eyes tells him the whole story.
If you think about it, you can see how her crazy ass got there: how could he take this offer, this good faith offer of reconciliation, and throw it in her face like that? All she did was consecrate their child to another religion and name another man as the father. That's like a regular Monday for her. How could he be so blind to the declaration of love it so obviously was?