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[Sebatianos]

Father love must be at the maximum (but the only way you can even see that hidden meter is by cheating). Also you shouldn't visit the Prince too mush (the young officer at the castle every January), the charisma shouldn't be too high (or she'll become a royal courtesan) and the morals should be somewhat low (otherwise she'd feel uncomfortable.

also make sure you talk to her every month and don't send her to have free time on her own (with or without money), because that lovers the father love meter.

You should take as many vacations together and you should listen to her wishes (she might want to learn more of one thing, or be taller or something) - and try to make them come true (if she wants to be taller, you need the Cat's Eye - you can get it by cheat or by defeating the cat creatures in the eastern forest adventure (but rarely).

This should help, but it's not really something all that special (still you should try).