Are there hints anywhere as to how to move forward with certain PCs?
For Morga's family after finishing q5 you will unlock quest trees. For now none are available as I have just finished initial quests with this update. From now on I plan on adding them somewhat regularly. There are 2 more major updates I have to focus on earlier. Full Jobs and characters customization.
For other NPC's the relationship bar and love bar are your progression hint, though not every NPC has all options implemented yet. There are more NPC planned, to help me flesh out the story and I want my Patrons to decide which character gets priority.