Yeah basically he’s just being an asshole and messing with her. Then again if I were to play devils advocate it might also be that if it becomes openly realized by his mom she’s a penguin she could get kicked out (unlikely) or more likely that would get back to the dad and she would leave.
OK but where is my justice for her being treated like shit? If they need her so bad, she shouldn't be so complacent. Unsatisfying read