dont worry about other people. in my group of friends we all pe are pants in school on purpouse, to laugh at our selfs. when I was 6, I had to wear dipers to school. But I know what it is like. I wet the bed all the time. try wearing dipers. it realy works. if your teacher won't let you go tho the bathroom during class, you would not have to worry about having an accident and getting humiliated in school in front of your freinds. same thing for your sis. don't be embarrassed!!!