I hope you don't really consider yourself "living in sin." If you and your partner are committed to each other, you meet all the "Biblical" requirements to be considered married. Registering your marriage with the government is a man-made requirement, not a Biblical one. And don't let anyone tell you that it is a scriptural requirement under the catch-all "Give Caesar's things to Caesar." "Caesar" (at least in most civilized countries) does NOT require people to be married to each other to live together as a married couple does or even to have children together. Again, it's a mad-made rule. I'm not saying there aren't any advantages to an "official" marriage, because there certainly are. But not being in one does not equate to "living in sin."
Please submit 2ยข for this valuable "ruling."