Henry has been raised as Emma's son for the past 10 years because his real mother could not raise him. He eventually finds his biological mother and convinces her to help him, since Emma is a main key to the stories, and he holds the fairy tale book that can save the entire Enchanted Forest.
Emma: OK kid, what's your address?
Henry: 44 not telling you street.
Emma: Oh, kid. You've got problems.
Henry: Yup and you're going to fix them.