Thank you very much to everyone for the thoughtful responses! I have thought a great deal about my feelings and am coming to terms with my jealousy. I have talked with my husband and he is becoming increasingly supportive of my concerns, which has helped a lot. I have also talked with my own parents who have also been very helpful. They all have told me how much they love me and have echoed the sentiments that you all have posted. I am going to invite my future sister-in-law to visit us and I hope we will grow closer and become friends. Thank you again!