need to vent

Just need to vent for a second. So my husband has a son from his previous marriage and we just recently moved a couple states away from him due to the military. His mother is also in the military so that is why he must stay there. I just recently found out that she is planning to get out of the service and move here to where we just moved to be near us. Now I am in 100% support of having him near us so that he can have his whole family and I would never do anything to hinder that from happening. My frustration lies with his mother, as she has been the root of problems in our lives. I just got off of the phone with my sister whom is my best friend. I told her that I was less than thrilled about having this woman more available to intrude on everyday life and she got mad at me for that. I feel like I should be able to vent and share my feelings with here without judgement. She knows without a doubt that I will always do what is best for all of our children but she still felt the need to pass her judgement like I am a bad person. She has a perfect family with her husband and two children so I can't help but feel like she shouldn't be so hard on me when she has no idea what it feels like to be in this sort of situation. I understand I signed up for all of this when I married this man but sometimes it can get a little overwhelming.