>"I can devote all my time to learn and help him but I don't know what to do." In my opinion I suggest: ask your brother what his **behavioral problem** is exactly: a) does he stop breathing out b) or does he stop moving his tongue or jaw - during a speech block? Next, ask him to speak while having the intention to breathe out or move articulators (depending which problem he has) and ask him to focus on what feeling or thought he experiences that increases panic to stop breathing out or stop moving articulators and then work on those 'reasons' that cause panic. A tool could be pelvic breathing, but in the end it's not about focusing on breathing and not about reducing anxiety (because we should be able to breathe out WITH anxiety), so what is essential is 'learning' that the anticipation is not true, our true intentions, fearful and is less probable and learning that we are able to have intention to choose to breathe out. Essential is awareness over distraction in order to learn and carve neural pathways. Unlearning behavior and re-learning: So in short, ask him to become aware of what he is focusing on during a speech block (eg anticipation, stutter pressure, body tension, tensing speech muscles, hearing himself stutter, techniques, word substitution or secondary behaviors). Then ask him to move his focus from that to the intention to breathe out. Note: make sure that his anticipation and stutter pressure stays in his body, don't reduce / reframe it otherwise he won't be able to learn from it (which is how we change the hardwired neurology from learned behavior)