I cannot tell you whether or not you are sinning. I can only tell you that I cannot recommend allowing unmarried couples to sleep overnight in your home, especially when their example may very well corrupt the morals of your children. If they are asking to visit you, you can say, “Sure! Where will you be staying while you are in town?” That should indicate to them that they cannot stay with you, but if they ask, you can say, “I’m sorry, but that’s not possible. But let me know once you have a hotel and we’ll plan to have dinner together while you’re here.”
