It's leading up to the Duncans' final moments with the two eldest children in the family; Teddy and PJ. It's super hard to say goodbye, but it has to happen. Meanwhile, Gabe has some relationship problems and it's even harder for him to say goodbye.
With Gabe “dying" and the War in Heaven, Sam and Dean Have enough to deal with . But after Gabe returns and the Winchesters realize they are... Different. They don't want to tell anyone, not even each other.