Peter wasn't nuts about leaving Cora, honestly, but he wasn't going to deny Lydia what she wanted, either. He helped her get her things together and fretted about her walking to the car, which, at least, he had driven there earlier when Cora had been admitted.

"Just a minute," he said, moving away from Lydia's bed, back to Cora's. He brushed his fingers lightly through Cora's hair and looked down at Derek, an apology actually in his eyes for a moment. "I need to take care of Lydia. Call me if there's any change or you need anything." It wasn't really a choice, not like it might be for someone not them. Wasn't a "girlfriend or family" situation. He'd chosen Lydia as his mate, claimed her and made her his and that made her pack, made her family, as much as blood. Their girls needed to be looked after, but needed separate things. Derek would stand watch over one, he over the other, and they would both hope Scott kept Isaac safe.