ANSWER: This is absolutely prohibited.  You must immediately discontinue this and sincerely repent to Allah.  There’s no obedience to anyone at the cost of disobedience to Allah. However you must be diplomatic and respectful towards your parents in all situations but keep firm on your decision and not continue this class at all.

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ANSWER: She was born out of wedlock and hence she is not your sister. However, you can’t marry her just to be safe but she is not your mahram. 

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