Now i m 24 yrs old , when I m 5 yrs old i started stammering , my father nd brother ( stammering started at the age of 6 now he is 20 yrs )also have stammering , but when I sing a song nd self talk at that time I can't stammering , nd also at the morning time we can't stammering as much as evening, night , afternoon sometime when I talk to my close friend nd with my girlfriend I can't stammering, i stammering in specific word like a , e , i o u . Give me geniune answer is this curable or not ??