Question: In what episode does Henry Mills' biological mother help two children track down their father before they are placed in a foster care system?
Sentence (from "True North (Once Upon a Time)"): In the episode, Sheriff Emma Swan (Jennifer Morrison) helps two children (Karley Scott Collins and Quinn Lord) track down their father before they are placed in a foster care system, in a parallel with the story of Hansel and Gretel.
Relevant evidence: Yes