The exact same thing happens to me. I am a 13 year old girl. My parents got a divorce when I was only 4, and since then it seems like I can have a conversation with any of my family members apart from my mom, my dad and my sister. I have been living with my grandparent for almost 10 years and however, I can't speak to them. All I can do is answer when they talk to me. I usually answer with just yes or no, because I feel like I can get any more words out. Sometimes I just nod or shake my head. And the same thing happens with the rest of my relatives. My dad is always mad at me because I don't speak to his girlfriend and her daughter. They think it is because my mom used to insult them all the time, but I am starting to think it might be this. For a while I have been thinking that the only way to explain my behavior is social anxiety. I match most symptoms. I get extremely anxious in any social setting, I can't speak in class and my heart pounds and races, I blush, sweat and my voice crack constantly while giving oral presentations. But know that I know that this is also a symptom of S.A., I am ever more convinced.