I wouldn't suggest hiding the relationship from your father for too long. If the rest of the family knows, he's going to find out eventually, and it would probably be better for him to hear it from you.
You're probably not going to be able to change your mother's religious views by directly pointing out the flaws or paradoxes in them. Instead, try to find out what she's really worried will happen if you stay with Emily. Is it only the thought that you haven't followed Quranic law perfectly that is depressing her, or is there more to it than that? If you can deal with those concerns directly, there's a better chance that she'll slowly come to understand there's no need to be so strict.
My own example: I didn't start dating till I was 17, and at first it caused a lot of conflict with my parents. They're not as religious as yours, but they're very insular and anti-Western-culture. So they acted really cold and hostile to my boyfriend and while they never told me to my face to break up with him, it was obvious they wanted me to. But the real problem was they felt like they were losing me to the world. I think it can be hard for parents to realize that their kids aren't just little versions of themselves, that part of their kids growing up is letting them find their own values. So the thing that has helped most to heal my relationship with my parents are making sure they're still involved in my life, even though my life isn't really what they'd have wanted it to be.
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"Nothing is at last sacred but the integrity of your own mind." -Emerson
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