I can totally relate to stuttering more around parents.My parents know that i stutter and they are used to it. I don't care at all if i stutter or not around them, but i sure as hell stutter a lot more when around them. When i lived with my parents i didn't go out that much and i seriously thought that my stuttering is getting so much worse, because i sometimes couldn't say anything, it just blocked. Usually i just told my parents i can't talk right now and that was it. But when i went out with my friends or family i didn't struggle saying words or sentences. I could always atleast say something. As long as i wasn't at home my suttering was much better. Now the fact that your mother got mad at you for stuttering that's pretty new to me. As my family don't really brought out the fact that i stutter. One time i remember that my grandpa got mad at me, i was looking at my phone and he asked me something. I wanted to answer it but i stuttered pretty badly. So he yelled at me for playing with my phone all them time and i can't even speak with people. Oh for fucks sake, 16 year old me got so mad at him. Don't know about your situation at home maybe your mother had a bad day, don't take that to your heart.