Graham telling his children the stories of their births, especially Morgan's. Made extra sweet if you know that they're actually true stories about the director's two children.
Also, in a scene that was sadly deleted, Graham's story to his brother about the day he accidentally hurt his arm when they were kids.
Graham talking his son through his asthma attack. Oh man...
The ending:
Morgan: ...Dad?...What happened?...Did someone save me? Graham:(Through tears) Yeah, baby, I think someone did.
The final shot of Graham getting ready to work, finally returning to his position as a preacher, while the sounds of Bo and Morgan playing and laughing can be heard in the background. Cue the tears.
.